Malicious PDF — malware analysis report

Static analysis result for SHA-256 3972426e32423698…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 00:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b33cab7e0b1667b5309b5bfecd7019c SHA-1: 1a50c1d11c53fd50dfb898fff2f647934066a396 SHA-256: 3972426e32423698933ed1685c05fc57bb272ece5eb73819a66f9ccd29d7597f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2a12265e1---fofikeladori.pdf In PDF document text
    • https://doluhosting.com/calisma2/files/uploads/49882988180.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/57948984430.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4f93dfd82b05a9500ba77806384a1375/53200658056.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/jotabusopekomigonorejo.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/7319593945.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160714660e4361---26358453131.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/xamoxugipasiwidajima.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d8260579d---16674722427.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kulune.pdfIn PDF document text
    • https://loctra.net/userfiles/file/66044666267.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/natidipezuwanuduwipijorob.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611a44de54af1---kidazegupipo.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/4642043663.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/29027406929.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc290a682---vabojagerezimerutoraj.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/vibovewex.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/fekitex.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/41497368493.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2669c15574---37207296695.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/64344157275.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/be828aa3498cabf3561ab7d6c8929e74/vilek.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/66dd2uercf660thbq83uhr5so7/35517945017.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/55ad6f7fcdb93b254695674c68ec37f5/luwowigasadozurizewam.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/29091076490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=big+m+and+two+phase+method+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_off0000c903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 10936 bytes
SHA-256: c280b68ba6c4ada9459c3d3b31501d79011c3cec647d87cdadb7bf4d2a1ebbd4
font_01_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 17580 bytes
SHA-256: 0f2bc0fe9d08137204aefecbccfdd6fa65281fc0a9a3fce7fa5a9946fb2c34d6
font_02_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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