Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c748a9aa1a2b214…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 18:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be2e3364118f260fc033b77a22792cf1 SHA-1: d7a2466fa485aff80fd429795f27684a9aab9937 SHA-256: 0c748a9aa1a2b21451cd803da3f51c57f8d5b2b5bcf944d7d915b74b6be2a106
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of random and compromised URLs. The document body is unreadable, but the numerous external links, many hosted on potentially compromised or disposable domains, strongly suggest a phishing or redirection attack. No scripts were extracted, but the presence of external links points to a potential download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://marbeyoyun.com/calisma2/files/uploads/22619722148.pdf In PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/gorubugasemefazoduwefataf.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/marinawabup.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/nanegupokakifosi.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/soroboxumudijafobofos.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/55192759241.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134333fbbc1a---10133406872.pdfIn PDF document text
    • http://dsagco.com/Upload/file/tufaxoxojovuworizi.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/32807118359.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/togopelulejozatomejagene.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/49535519656.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/cdp890kvfipavrv6qp1acr0vgt/10252314350.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/pifabilolusibodujo.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/77210867290.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/5322779088.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-05/images/files/rojuzofibesupodivon.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/66449299360.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/rerovademefiralapovima.pdfIn PDF document text
    • http://rsentco.com/upload/file/vunakub.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/jipizerup.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/tijumevifigilirokupuvesa.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/gififosevifuduwis.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/wobuliletopixuniwazifafew.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf34362a8---gasomodamupuxofedanar.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fexilite.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/85717576739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=eilat+map+pdfPDF 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_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 10016 bytes
SHA-256: 30cecf4184f7c354c14b3170963b310efa69c5ae36d0ae65cff8523020408965
font_02_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 16436 bytes
SHA-256: b1b47d9fb4464b887fe1c36410426c5430b1e3ca5d6e480c3c2bf9c333363e30

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