Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0c5123fea4f199…

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 06:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec315cf52e7fedf3d1550c2dcf851d9c SHA-1: 3af075c79ff1713522958ada663cb632937c84a2 SHA-256: 6d0c5123fea4f199a419074042199d5430ca16d5522451a4d1dd84aa1f275637
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS upload directories. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that the document may instruct users to open a password-protected archive, a common tactic to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 http://www.civilhospitalpalampur.in/img/uploads/files/buwamodisukoba.pdf In PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/52526835500.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40ea260c9d---12002568883.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/jinaniruxomiloga.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/14374082867.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zanewexuxuf.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/tefegakegaw.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/vb72ul37v2j42i9pchv3mg4hv7/gibib.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3182l9hgavinvt2a49qqccuv1g/85504963100.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160afb93549b06---gonexagipinugimepadara.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610000561b5f7---gilamamabiso.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2986b4f4b---sukixanopabetukatopa.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210801_035054.pdfIn PDF document text
    • http://hanifeugur.com/image/files/31249728604.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4ecefb294907ffa412a53ac8e8800023/14431497377.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/51635715676.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d239d1923408a8772d41dcbfb5403a4e/siwikaduzu.pdfIn PDF document text
    • https://electroagro.es/pub/files/9523596069.pdfIn PDF document text
    • http://linker-apps.com/files/paludibepurafaradu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/lalaxubamewe.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160913ce079a17---wakukigafedodelir.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/q7ve4igrir6ni77i8d2v08pejd/fexofoxugizeto.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210812182447.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7k407jn01kg11k3o9qpfbspn1a/jidusobiwevoferudola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=eisenhaltige+nahrungsmittel+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 10908 bytes
SHA-256: 92886d3753f1736fe131aeb9e589170a616837e7d7561130e22781749ba1e0a0
font_01_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 20380 bytes
SHA-256: 682b92d5845e223993f6de9866bcbf58f329ade2a1e7fa961bb6b86f6c706161

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