Malicious PDF — malware analysis report

Static analysis result for SHA-256 12974b65965f0051…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 07:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35502dfe5aa82cf3da63c2ecc6d5ffb4 SHA-1: 522fdb2f80ad34d3b96a773088af6596291d4331 SHA-256: 12974b65965f0051bca080a11e3fe5510f3a2bb6caa87377a88bda32d89e9f3d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm characteristics indicates a high likelihood of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cyc.cz/pictures/clanky/files/moveniw.pdf
    • http://jedwines.com/cmsCart//upload/file/pefokob.pdf
    • https://et-auditing.com/userfiles/files/8954546616.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7213c1181e347f80af21145eaea4be36/wawokijukexowerinaranid.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0303e8af32---39044674826.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3873cd310824def74f4564896348ff58/vajefeb.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/055f041715431c5319ecc87a59bb0462/70667587641.pdf
    • http://smn69.com/clients/866038/File/fakirawufapaxovimerirozoj.pdf
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/82439447823.pdf
    • https://tenekedjieva.com/uploads/file/depuxuvizix.pdf
    • http://buddhavehicle.com/userfiles/file/27588975122.pdf
    • http://www.almansori-ye.com/almansorifiles/files/77119304691.pdf
    • http://lukinserv.hu/file/nemiri.pdf
    • https://waelfawzy.com/userfiles/file/
    • http://villapellegrino.it/userfiles/files/jopufiwufitu.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9j4qio6a2e7hho2uin2pg5llo2/4790305144.pdf
    • https://addsfly.com/userfiles/file/velerawov.pdf
    • http://dungcucaytrong.com/images/files/podas.pdf
    • http://driver-jazda.pl/upload/file/mowaxolawam.pdf
    • http://jlm-kg.com/uploads/file/fomolevuxoremuvixoluve.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb872e326---13860695210.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/soxanufabosufuni.pdf
    • http://commandhousecreations.com/uploads/files/31349021285.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612940eee144a---juvalowesuguwumuvitas.pdf
    • http://0-50.ru/userfiles/file/39839811569.pdf
    • http://abhinavabhishad.org/userfiles/file/80943006921.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=resume+sample+civil+engineering+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c026.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 16792 bytes
font_01_sfnt_off0000d83d.bin
f6bd26c8deff6ac12bc3f37496ad8e522d2b07a0ad99121929143d66edf61bab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 10956 bytes
font_02_sfnt_off0000f165.bin
30b42628a23e1f3fb0282454cd8ce3551fea4a9a3a260b531fec3b6a2278a987
pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 16324 bytes