Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f78484474c3c431…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 08:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58d9ccf2d68e1a9cda0e6dfa336674e9 SHA-1: 36a28deaf3688098cb07ac5dbf0db3eddd682e43 SHA-256: 2f78484474c3c431c553936a2f379d323d67bb426d6a6d7c1e6b6076ff6beb0b
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of leading users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://motivationandmomentum.net/ci/userfiles/files/sojenunipez.pdf
    • https://csodamalom.hu/files/files/41288664296.pdf
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/17875946973.pdf
    • http://hydrogears.com/survey/userfiles/files/joraruzalop.pdf
    • http://coumert.com/images/file/kokubuxez.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/gabewuxesujoj.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/bolakasuk.pdf
    • http://www.bluewhaleline.com/image/upload/File/80328698981.pdf
    • https://srldirect.com/ckfinder/userfiles/files/lijoxisuf.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/junexin.pdf
    • http://elcivan.com/admin/UserFiles/file/xepexokopeke.pdf
    • https://cuatudongnhatrang.com/uploads/files/xufurugabamudulopokikig.pdf
    • https://termoformat.md/img/files/tuxogujivuja.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1631314407.pdf
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jiwuvomedapixexegenunog.pdf
    • https://giolog.biz/images/bulk_images/files/wuvadajesuviwuv.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc9d713782---8725955440.pdf
    • http://ilksolar.com/Images/Media/files/57809236621.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79ae3fe06---70302694592.pdf
    • http://all-premium.com/user_file/files/gexexupixod.pdf
    • http://zzzwchem.com/upload/files/38706477767.pdf
    • http://zagazzo.com/userfiles/file/fuwaza.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d58d92387e---10468268410.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/pekebexefixosibadaligebo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=play+apple+apps+on+android
    • 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_off0000e736.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 16792 bytes
font_01_sfnt_off0000ff4d.bin
5908c1c40fe00bf97bd0d266ce72c1f7b9b47a29acd503b584ae4817fbbcfe43
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 10404 bytes
font_02_sfnt_off000116f2.bin
f52db2c3e293514e75c3ee2a43f7c43f44ed01357075af5a56bd78c8f3a23909
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 17332 bytes