Malicious PDF — malware analysis report

Static analysis result for SHA-256 108e0d82f8880bb9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 12:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ab89746adee44d4c3ec9e10fcdcc7b1 SHA-1: 2a64ebcb7ee34175e100b28982f5b55c9f3af306 SHA-256: 108e0d82f8880bb93c3610951423cbdf3504b63054a1a536a4dfe69e0556583f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=how+to+backup+icloud+on+android PDF link annotation
    • http://cybernet-ap.com/UserFiles/File/motolevozukoni.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/xibivorejekuf.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/50585143612.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/28116288779.pdfIn PDF document text
    • http://foodchemsino.com/d/files/sodivoxixuzagarubufijax.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9ce485bca36153407b68e2d8179df237/5097156917.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/gexedugopowiselebatunewi.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/lujun.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/64656904578.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146a44a5dac4---mesifodebixapajepavowi.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210905_123338.pdfIn PDF document text
    • https://noddy.nu/images/file/27009655307.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/27415041516.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/koselatenixelum.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/fatodazojidaniremogumuxo.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/davarinegepad.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346edbc3e4---ligiz.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/16381180635.pdfIn PDF document text
    • http://premo.at/userfiles/file/dazoluginisemudojurelive.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/jijubagunexutodekapugibu.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/13713933042.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/59242575846.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/xuvav.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/14223358626.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a6dd28564463dae7953eccfc149f04b1/2671857602.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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 10616 bytes
SHA-256: 2a661303c0c17346ee06c421f9d2d9a23fb1bd2c1f73005fbbcde5cdff6b30fa
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 19392 bytes
SHA-256: 9e9d10665667ddb7163577f3edf55413774d050f0e42b70e8c33dc87a1ceb9db
font_02_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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