Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2201ff00786fc4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 07:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08dcbc9fd6ddbe409589177e2f80e2bc SHA-1: b9375d62427a9acfa5fee8602fb888d1a1845b9c SHA-256: ea2201ff00786fc4e42a4a7efb1ac1d2a4041944a4f575698ac7660242b51c02
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and heuristics point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=bl+manga+pdf PDF link annotation
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/sotenip.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/83212806878.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/koruxuramawatuximataku.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/lerugosuwemab.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/mitotidatotunibubunajama.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/83320446616.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/negatitovojiwiwabo.pdfIn PDF document text
    • https://telorgabus.com/contents/files/xafevidumejodenesuro.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/13635298277.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s23rt34e2b371879fl3114j8t1/zulosanupimanaladokovanib.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/17216381848.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210904095308.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/poxajisekitinimogufewo.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/doretunofel.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/tunevaso.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/94845031019.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/pipagofodoxifapavitef.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/82748026895.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/79189679075.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138034aeb9a3---favunolufevogiwitike.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d349146de---zukugo.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/goxexodenovirejoxubuxu.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/vavipomuvulomukudetegosu.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_off0000c0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F2 18088 bytes
SHA-256: 1a5f2021a61c322d57b1457dc19be314936158db0cb18fc38e0c26a8d6ec2481
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 10184 bytes
SHA-256: 16978d4107167600f4cd93eb5301e54c4bdbbebdaeb80fdbceea8795c1a05f61
font_02_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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