Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b659f117388432a…

MALICIOUS

PDF

86.4 KB Created: 2021-09-10 14:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5e503a4aec929dfa9b71a970cf97a07 SHA-1: f150c9a28d3f0d1b3fa7f5ec8bd066bb3d305b9b SHA-256: 5b659f117388432a6e8c386aa5742ee7d81b077ffca16b33bc6de5a948a12adc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://www.habitat-morvan.fr/ckfinder/userfiles/files/xulatazarixosu.pdf In PDF document text
    • http://minhledtran.com/luutru/files/juxegafopevilujatupuxi.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/80162530961.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/12700852832.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/12449352276.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/kagagibuwetibedulubepop.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/58970632383.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/wamunelozego.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/10376786509.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/37951446173.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a649d48f4---99903830110.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cgjb95m4gr2h5k00c3mbe3drb5/24904651380.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bdf849a0f4d95b88bfaa5b47b3dbf1c2/gumofotufef.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/rimowixaxovizizazevuw.pdfIn PDF document text
    • http://haai.org/upload/file/jetapopidedaxogedobap.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/93807203625.pdfIn PDF document text
    • http://cabini.it/userfiles/files/lijurogatolurelirew.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7421eb86---91707536863.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/sozelo.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/finobozenuvewofagineb.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/mojixegoke.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/85166318581.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/85734434751.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/84146037287.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/zexezomokuxe.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/vusurozadoxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ps4+controller+to+android+tvPDF 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_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 21632 bytes
SHA-256: 1b36a05460bb2ca4d83c16fe65fcd70e09502dc94c7017fd1d79850bbac2e5ac
font_01_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 10508 bytes
SHA-256: 3baa09e2f9d75dd06507e7f71fc420c790b30084737313914a1772934cb629b1
font_02_sfnt_off000133c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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