Malicious PDF — malware analysis report

Static analysis result for SHA-256 1875ba8ab37cfdab…

MALICIOUS

PDF

123.0 KB Created: 2021-07-25 22:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e0d2be2648058a52857bc9864ed167e2 SHA-1: 2d7f4829c00a42057e5f2f0af7b5d3a94ae00dc0 SHA-256: 1875ba8ab37cfdabab3adbec23e44eae3199cbd4dfc5cc358204af2471d04f8b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The presence of numerous URLs, many hosted on WordPress sites utilizing form plugins for file uploads, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8dca65923---68962130923.pdf In PDF document text
    • http://eperon-kochersberg.com/img_db/82915904807.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c792770056---85298565517.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/03e3322ae4118a88395b508d27213ba0/fefijeduzodelalidisodi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f6fee6e1---juxuruma.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/33596928729.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/51967dfae77d81a872a58ed672b5e6b8/70301609117.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d98c7151---66504553951.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9aa74c5ef1b6ebcf9562fb76d887ac06/36278652573.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c188624d877b2dc3ce99f6a14c36f09d/sogewawuxipibovakopagi.pdfIn PDF document text
    • https://waroproject.com/file/rurizivukelowube.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608111704f01d---magageme.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/37816129958.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/dutuvivisogutemizoji.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/fefuvulojupara.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/44088228241.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0be077269---10894587055.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/75615617078.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c20dc3e2f2a---69544267532.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6b27be0f---poxufukat.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/n94u39riv7nnoba9vgf85mltod/58726952230.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8t0pj0sc4su2ullp5qkcnhac6c/xenefebapu.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/39922387124.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607049b007966---medolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bartlett%27s+familiar+quotations+18th+edition+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_off00017df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001960b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1960B 17076 bytes
SHA-256: 829099cb648ee45d68a16e217e320d7354b3efa920a560a58e17195bd60604b0
font_02_sfnt_off0001c2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2B7 11356 bytes
SHA-256: 5f51da963e62bfb93d259b5e3dfdad58e45c7e2f3722a8a4c03d8d75873e75fa

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