Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1866b64c14c549…

MALICIOUS

PDF

98.8 KB Created: 2021-09-05 00:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe533031f6b6117d88372b414216b1d1 SHA-1: e60902b79c5a31e4fdb074f23b0d1a7c2507a02c SHA-256: 3c1866b64c14c5496f558c1a1870459beae785b40933461f168b9d456a86d420
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, designed to redirect users to malicious content. No scripts were extracted, but the structure suggests exploitation for client execution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://divapharma.com/uploaded/file/bumop.pdf In PDF document text
    • http://bioscipublisher.com/files/upfiles/file/32265151323.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae60d2843---31611538987.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5335ee6cea87807ce33708fd3fdf7432/82297423471.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ab97d4c4e550a930b381f85174d55fbe/dezedilokebimolefelupumop.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/dekuwolibivopu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c102027cf1---bazinalel.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/22819456061.pdfIn PDF document text
    • http://starsunited.at/upload/files/5529757062.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bba0a5943de---55898790265.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/74004021075.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/17610721569.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094009e6e9fc---75033828551.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c76d3e8dd029b3672be27f48293f1679/patiw.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/totexogegivemi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba61c5cb13---5632719574.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/zuneli.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/24817513556.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/lizununinekusaka.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c859e78fdaa645f45360989ba50a9e13/wunoputupogosibaj.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i6mhnaolemohf3l2ff6vst59tk/nafilofovowipisotakage.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81816ad2ec18ae4ba03474b3fd9a3a29/vokuwulisokobividibuj.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/wazibafuxudijobigolaxas.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/verusi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/nikezowaxigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rudiments+of+computer+science+class+12+pdf+downloadPDF 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_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 11184 bytes
SHA-256: c46219d1306b25a0e15e83219d16e0387e0e2462eef55a2bf763d1a38ae91e03
font_01_sfnt_off0001391f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391F 17200 bytes
SHA-256: 74b440db3d7e62fa9daa46284a0e10aec876b2248945eb1094063c5e5de54023
font_02_sfnt_off0001652c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1652C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1