Malicious PDF — malware analysis report

Static analysis result for SHA-256 939ba3b9ce88b154…

MALICIOUS

PDF

88.1 KB Created: 2021-09-03 04:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3acf2c753678bd539248d6a21ec88e3 SHA-1: c4317bfa5adee0248186e96c0531bfa4b2d67824 SHA-256: 939ba3b9ce88b154d425e32d86d04f8bc88b3db615737a6a7988bfc7f7406ec1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of a visual download button lure reinforces the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=wacker+neuson+e3000+parts+manual PDF link annotation
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/75372e20f71b27b324e7d6bd7466bc23/7770244502.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/momeduvorolot.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/70981167648.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/45385993620.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56e74afb1f---boverufivomuxeveginu.pdfIn PDF document text
    • https://teamcode.net/upload/files/75244211311.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d28f3a808f5---rakibez.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106271648062908.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/rifolilazejugupisezigagef.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/27563952919.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/28fd45643abc05a11146f8014b602fb7/negone.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/jekorewajoxenazagu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e448922dd95---folijabom.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/98730510646.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/76426886236.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7965c233---28288817923.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/59244188657.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd50aade79---fimojobuligejin.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/47818464265.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/55963508611.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/61894803243.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/juwatolewigirukadeboset.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/bewifadukokawojawejizar.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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 19284 bytes
SHA-256: 1731b1591f7e77c2153ccf8a0374df4aaa4ed36edbcc05c37070e9306e5b6d45
font_01_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001379f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379F 10924 bytes
SHA-256: 258c6acc5645cff8a3b74e04b3119da78fadc6b605419959aa8ebecb417f4be8

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