Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aaf9b26e519d7e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 08:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e20bfe973fa58554ff984e09b41de3c SHA-1: 4d17c7a629955bc810365d20de83ecdd509a6277 SHA-256: 76aaf9b26e519d7ea539d39300f81baf247c26ace7e46552bdead901361a9201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=types+of+linux+operating+system+pdf PDF link annotation
    • http://younewstoday.com/task/userimages/file/majuweb.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/zivopivoj.pdfIn PDF document text
    • http://prograsifkalip.com/files/37663422821.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e588887e6fdffefb2e4a64c97a97385f/67594439442.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8c260a33f---wamunipu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/mezofixek.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fodagumip.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e0f85900---80794201930.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/16647347332.pdfIn PDF document text
    • http://clingac.com/d/files/zububasobezu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b00a3c866194cdca5ffb10685326bd94/98858734540.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/ribabenejobuwebo.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/burevudoriladilurawuze.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/1983058961.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/pexududomireriz.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/reruzirowal.pdfIn PDF document text
    • http://4bx.pl/public/file/6534652996.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/15707070638.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/vapamu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pivomabekotamuxawomusar.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/wijekowux.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c36a5558a85---38177150846.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/20625196076.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/75694406370.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/rinitepedidukapo.pdfIn PDF document text
    • 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_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 18392 bytes
SHA-256: a77eae05c84ff627562639761ed8f628cc5ae44b5f6ef8a9b23a95a93602c1aa
font_02_sfnt_off00012ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC2 11120 bytes
SHA-256: 7709a302025564e9d6f2334ace6e4a8c8d1859ce9d0781c8a76c8947f339e2e1

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