Malicious PDF — malware analysis report

Static analysis result for SHA-256 c971cbb06ed792ed…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 01:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5bdcc793e698b7aedfc690421d7d7aa SHA-1: f665586e311b478961c8ae17afdd81da11a489aa SHA-256: c971cbb06ed792ed3e14b993d6bd96828d37589d4914341291ae20d17316f57c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites hosted on potentially disposable domains. This suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://linkipt.com/_UploadEditor/files/11982133580.pdf In PDF document text
    • https://tenfci.org/userfiles/file/10064804916.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/809fff04f44631995699bbc926258d72/48756902063.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c3b4d66670cf1747d34c6231fb9b68ee/dazuvesulokibi.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109151518338750.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/nomeperiw.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301be528c93---48632489349.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/zegobu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/00360644c2209c88486bdae3b760d66c/49519171658.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/sivafom.pdfIn PDF document text
    • https://adikkedua.com/contents/files/41180140396.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/tusit.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/27024970500.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/goxirofezugivebitekomanu.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/getedofitozadivegedigogiv.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613671f910d0b---93556110483.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/vorobekujelaroramumovo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/55978666881.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/57934975273.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32817095a---42454028724.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/sidexosupitogetomu.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/97903485989.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/56121353014.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614452da7da56---betesudinumatinud.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/lunafagulotij.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/butavokarofikiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nintendo+3ds+no+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 22296 bytes
SHA-256: 50e9612613af20113329cb1f1a36e6698035765a65bc3770cd321360204e55c5
font_01_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 10344 bytes
SHA-256: f8c6a82b67b6f7fd54143658a845ad69a29761d50296c2592b0ca990e847010b
font_03_sfnt_off00014580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14580 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729