Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08a41f22f2b771e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 09:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3f0266c98e2d43c16c95285b7f3b9bb SHA-1: 222a49bee666d90564c4e600451c96a2a6018ee3 SHA-256: c08a41f22f2b771e50c80889a97e0a4410aef37841617b5169893a8105c0fec4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a distribution point for further threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=index+of+dominion+season+2 PDF link annotation
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zajifu.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/pafumoxurajexopaku.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/semotimilexupef.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144d880019f3---fefutu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161456ee3a4e40---sokekifokoxuje.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/84747941177.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/vadexo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134025c8b04a---26331223082.pdfIn PDF document text
    • http://cbstav.cz/file/76907286285.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/13/redoxapativizapabomibadim.pdfIn PDF document text
    • http://idcla.net/upload/files/ligofoneretafumijol.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/85805990879.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/78487257105.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/7187181858.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/roworikegadene.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc8565c25---fefitovo.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/riwinukanizog.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/guxuwozetujasinezibi.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/widusixepodutawexuruji.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/67395608215.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/pukonelewopewesisobigo.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/tatisulapolidafefaj.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_off0000b052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB052 15456 bytes
SHA-256: 84bfa80d422be649943b4952cd5bc88494585374cecf4e1c338935d57769fbb0
font_01_sfnt_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 10444 bytes
SHA-256: 48306e971a95a835116d5b47660758a349941f14577c2010954007fe501baab3