Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fc1621d1e372ae…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 07:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30f71e24882977cffaf01b5a51c17b90 SHA-1: d70fde839e85e9e9df041ff3b3b24e52f02d5e1a SHA-256: 57fc1621d1e372aef23dff35c475805d72c41d61afbcb767efbe171bc24a996d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential phishing lure by requesting one-time codes or MFA confirmation. It contains numerous links to external sites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious landing pages. No scripts were extracted from this sample, but the presence of multiple PDF-specific heuristics related to link farms and compromised uploads indicates a focus on external redirection for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://cructi.ru/uplcv?utm_term=gingerbreak+apk+download PDF link annotation
    • https://autoskola-scp.com/files/60888974896.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/33784071956.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/pobovitovatiz.pdfIn PDF document text
    • http://paradoxine.com/upload/files/wulotagubizabikajewa.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/49899372551.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/wuvegowimafetidifobe.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/79531554990.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/vejulafapamile.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613685bd8f5ee---20097966042.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/vinefunafe.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/28499924713.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6974af1f7c5fc37e6815a0a73cbc2759/49233819088.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/rudegosageledofudub.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/nisafuledobujeja.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0ade5916---losuvizewevoz.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/lupumilapaw.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/72744418769.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/fubuwusowufoduferaped.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcb3ca411---64014044399.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/lovarimetelosatenirav.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f73d04a1---jigezebasozulutisal.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c75a072fe6cbcf21ae03027515fe68c9/ripafizajadugobubateri.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/ledinojuxijowojufatafamin.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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 10660 bytes
SHA-256: ef0ce38dc90b34c815739bb04983f659bf2a2e851b6293051e50d1c3e278ca14
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 17764 bytes
SHA-256: 4e0d38ac5a8caad6c74ae893fc277ad567d55ee6107877db45dd5b09a336205a
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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