Malicious PDF — malware analysis report

Static analysis result for SHA-256 f531d1c535aec9ad…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 10:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 900eb76b5157c79bbce42c2d4a2a20c4 SHA-1: 38ecb587cedbdc1fa9f8e640ba20ad2369ce222a SHA-256: f531d1c535aec9adf113d5f24cc58e047ca5a4036ad495ecbba110848ed0d24f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4fa52d789bf588f24ffaa04d61a343df/11710863259.pdf In PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xatabigiwajorapuni.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/wubefuwuxi.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/zijokuw.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/jevemisuja.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/94435445596.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e0547ea8---safixej.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/sowumozupejepupesa.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/dozibi.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/zogefukivom.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/93096332977.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/kajozuxulibejeb.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/90995854842.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/gasawerowono.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/4453523147.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/pevakudedigutigema.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/17626997951.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/dowotiporararafoga.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/zenasa.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8664c5cae8b4298e757aa19a6b48a7e0/28980202524.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/xurajidexijorutekoga.pdfIn PDF document text
    • http://silver1979.com/upload/file/gusefe.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bcf32dc984d1e8b90a643b2c8d7dd6ce/79362584184.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b28a79d3---46970444031.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/banerowegemamop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=four+winds+meaning+biblePDF 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_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 10796 bytes
SHA-256: 7a6f345f3443a2154b3c9b620008e772414c9ecdecfe17dd88659202cdfbf872
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 17636 bytes
SHA-256: 99b2497c156061f944a31ac661cd81d11d7ce121cbc33cea6c10d0ffe0b4d792

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