Malicious PDF — malware analysis report

Static analysis result for SHA-256 f743ad135be430a3…

MALICIOUS

PDF

83.2 KB Created: 2021-07-19 14:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2b53d0302a13420da4335a01909591dd SHA-1: 952691cc6707030f026e53e3d457704e7d72f5f9 SHA-256: f743ad135be430a36b9f92edd2707564cab1ff831f137f373c3d2b147a5d889d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/46i9h7pqge02aut4i2j6aaks9j/bojilovolutofopuviwunurun.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093e239c85ca---43016686427.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/81462373929.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zifejusazu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ae07dadc---4747677027.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5b3973f224cf03ff3bdb5f3e249f771a/zapipekudoguwitomevebo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bitad.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/52792629556.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n9oqfjf7b44vruclo0jh2t2u57/41782958058.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/71004578324.pdfIn PDF document text
    • https://chp-travel.ir/data/file/64608123345.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6324634dd2620cca60d9bdccc3a808f3/29061115406.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/zefixexa.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609271f362dfb---11063601811.pdfIn PDF document text
    • http://climtech.com/files/files/petesisekuf.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/74192231951.pdfIn PDF document text
    • https://micsys.in/userfiles/file/bigewuxejugabovoto.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/32375531367.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/daruvanaganoj.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/33279111301.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/64d6e6af4a003834ba7fe16a2b0d0621/gepuvukifebevidubovurugex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=example+of+sex+linked+inheritancePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 11064 bytes
SHA-256: 123436191c5094d03e79d4a55b35e5d7284512bb8bada69f8702d88f6b4c3e59
font_02_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 17392 bytes
SHA-256: 52def575f7f434fea074d00bc2fe90f96f4852604d78a1740592796e337941fa

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