Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4b036e786a300d…

MALICIOUS

PDF

95.0 KB Created: 2021-09-06 04:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f88578a3782bc0bfdc1dba064449ca1 SHA-1: ad5f7739e3bae80b56126949102406ec90b6b064 SHA-256: 8e4b036e786a300de4f171c3c5f19a66698efe1615ef2a503ed0558f374b4c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The document body was unreadable, but the presence of numerous links and the ClamAV detection strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://ronaldtan.nl/images/photo/8543698114.pdf In PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607902e12df33---limidegobekaku.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ropaqpkj23pr04dvhd98fim5m6/tisepabubali.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/kasorukegejavogerira.pdfIn PDF document text
    • https://manenshop.com/upload/files/zosigizadasavevefaganude.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/fajiseletixirinop.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a586295815c---tusajagafawa.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/genuboripeki.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcdde0d6ff---79210465676.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/22105473480.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126e73c8fead---setiwaxuzigir.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/gojiperesonunesewatomikag.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/mixuviwejofiwedileregate.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/zixawevunezawika.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b8b3cb1---11550062273.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/godowov.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d068a03c7---bizizivugatifaxoj.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb23d3d07---dizadod.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gasesawosozaxuzuronewi.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/27659235605.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/pabidobukogomujeji.pdfIn PDF document text
    • http://gnox.vn/upload/files/nijavapibimoputedajapapek.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/nulatebakuzere.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/62114881498.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1e3ead3d---35515284872.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/pixugugokijifu.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/52189235473.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/73032546151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=doctor+who+journey%27s+end+script+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_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D2 17760 bytes
SHA-256: 0d6f615ea96a5a5cf2128e9d4aee060f39853f4a37b75917cb75e33a5d6a8bca
font_02_sfnt_off00015431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15431 10976 bytes
SHA-256: c04dc68beaef65c5becfe2715c6b2425d956a3b87c724cec9dbf17f1acfbe3d7

Open this report in the interactive analyzer, or submit your own file for analysis.