Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d6c352ee5546f7…

MALICIOUS

PDF

63.0 KB Created: 2021-06-24 12:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bc8c4891b6b84807ac4f24b1cd206bd8 SHA-1: fb898234a3fdf04364c91f49c360ef45fe9af36b SHA-256: 72d6c352ee5546f7e2cb9cbf2c37333052a6dc4d7abc7d28c7df4173bff9041e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3lq0o4tamnn0j4uib5uieh47i/18615458057.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f640171daa64c4682bfd0abfd0dc1b62/dedipiwakalagad.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210603103157.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/bopokaweja.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/10500792497.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7bb1e9d7---31476736158.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a984f2e716c---xezugesim.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/24843674692.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/pipeku.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/faxitekuzemapikuloximegob.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/51166197314.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a5ea788f4062e270a1f2c1ad54600663/15339292939.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/8365277217.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b785c7b0c4e---68199182804.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3699eddeaea7e877ee13c34a3ed670dd/lobumakojekep.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/gemagidakigularakokujexik.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/291917b5ba6e36eb61e6c91656672f7c/91454955029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+of+hackingPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 4632 bytes
SHA-256: d8d64e41434305a1a8c5a97377a0104f594005c7594be14a06a967ffac37ef83
font_01_sfnt_off0000c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F3 9740 bytes
SHA-256: 772e5a670cc26c4e89ce61ba9ebdb008d4c6ad522ed020c12d8068226ac3eb94
font_02_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3