Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f180feb2e5d5a40…

MALICIOUS

PDF

101.4 KB Created: 2021-07-02 15:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 99779d559205366a6db52f3e4e642478 SHA-1: 978f94b742a873bc4a660c5d68fcde6fa3d3bc15 SHA-256: 3f180feb2e5d5a40ef28e62345986741b39906ac34cb5d07de7cc570410ed6de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, further supporting a phishing or redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9309

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/82vqkaete2uvltdfacuk0gp26m/21535830482.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087120d9473a---62292313303.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ab61d8c02bc095fa54a88ea41543e8ab/sinakivilupekesigomaker.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/xerubixudegifejapu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609772face7b1---jesitenawufiwisi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a4ceefb3---96612823922.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/rabizukulukimuzadegak.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/88558107575.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608505c1bb242---bifik.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/xekusodewevezi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d28c37d0db72c44f133b48cca1d1890b/sozoxagevaresejenepam.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/1329901330.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e9e3e590---nezofifogesokutupokogu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bb0d092f01d72b32e8843e3578ce72e8/jemagoge.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e6b68e23---gemizer.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e905861bf---75421581754.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030423179931.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ae0a59ca57df111373c2a26942b0e0c8/32184511889.pdfIn PDF document text
    • http://ktcz.eu/files/files/gejafemumibanilam.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/688a39c478c3d68b3b838fa1ff0d5e36/kitoporevax.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/49251643911.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db7e3f8dd---37652662282.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/395nou14csemm98gdd5vpeam32/4490056956.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bec02cb545e5b5c131328013a206a293/17204828252.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/23382780903.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca09196610---87154434194.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/53564423991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=d%26d+days+of+the+weekPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000168cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x168CD 18548 bytes
SHA-256: ab3821a985699646db4083418f969ec4cd3676612a978a6701b78d9632661563
font_00_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 30668 bytes
SHA-256: e0e5575c04e6a9b6a5ac036aa3f03991a914bbb90d47936453e63c2b11699f45
font_01_sfnt_off00012e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E39 4228 bytes
SHA-256: 9408ae7c0deaa39c9b4d84325c9b079c5305be182f3fec3d5b0477f1e13d4cbe
font_02_sfnt_off00013e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E17 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_03_sfnt_off000150bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1