Malicious PDF — malware analysis report

Static analysis result for SHA-256 73424307ce8c89b0…

MALICIOUS

PDF

96.3 KB Created: 2021-07-23 16:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6510d1e9b24f5b321baa963b35e56033 SHA-1: 31b1e5bc0a8cfc75858d44e3e4c3ca83e961f6b3 SHA-256: 73424307ce8c89b0166154745f8b9fb9ce31fc428e28fa877ae730c10c0f10e9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads suggests an attempt to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no clear user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://accessprecision.com/userfiles/file/tifiniguvejakulobivedugu.pdf In PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c5f77dbcaab63618e163b08631d281e/virimojejorogibo.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/zulixopukidizaguzalutow.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/63745307459.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdabc887a57---neruzabizif.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/bijotupiwagifekulu.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/dde66590e9eda4023eadb1c14affd5c3.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/telulafaxubiwidopikaf.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93619e6500249c78ac698a9d9e39fb10/pevibikarodita.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722a9cb55d9---10658470033.pdfIn PDF document text
    • http://armanetti.com/images/3723278206.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/11802633958.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9d0bba45292c5878ad5d349165880c2d/78400473444.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa866f5beb5---musunuwepubep.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e223aee49---wufifadenor.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/dadaxozatenozaf.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c22a01cc9---7785152251.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/17542248702.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b542478c891---wasogug.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160756ee782ff2---zerarutobawevutuduti.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e108c80df0a---terafe.pdfIn PDF document text
    • http://yuha.be/_files/file/xufuxaxofiginozi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gh8silkorfjqo8fmv938047qn3/moriwelowaxijuvabubevuzip.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/v1232qoq22j4j6lfsapjosh8th/dunoxakuro.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3f92793d---30989958416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=recommendation+letter+for+college+scholarship+samplePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 11112 bytes
SHA-256: e2de2c9865d9fcab532d4e99e60ae6caa334b9b2ecee7877005465cbdaa7bf67
font_01_sfnt_off00012f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001475d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475D 16876 bytes
SHA-256: e6d697085cbd214d251f5c764f69f19f98595c876a625fd786536cf232de1a11

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