Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15d53031c18a5d6…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 06:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4755a415e2d4d6c6893173398ac67c3e SHA-1: 4f613e30168d202d30eb1196ca6154f711499ed2 SHA-256: b15d53031c18a5d68bdfabc56fdc58bf34da6f8e4e02fa20eba68dfe2f62808f
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://refta-bg.com/userfiles/file/pelupubasusigizoseten.pdf In PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/3491099497.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cfmh584u0khs4ju7qnnfr7pil6/kedusitinej.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/69137160772.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/72749668046.pdfIn PDF document text
    • https://signika.pl/Upload/file/zikonowotiponagogo.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/jamex.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/vitefetifemed.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b99b1bcb2---zijifi.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/93373940496.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6148b3cf03f309d6632624e623d53403/wudot.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/68121601696.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/rinelenedasomadukovunil.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/d796006ac4b58fa9ddfa412f47f98129/57888002407.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0b9bceb2e2227fa37a72bb82d39c3044/kuxarepokodupe.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/napuzizamepu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbe64f33d---vitonug.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783564ed77---37744000889.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/92909409266.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/pebisimuromidedipo.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210730013103.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/90141192707.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/nijofatu.pdfIn PDF document text
    • https://pellevah.com/upload/files/22269616740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=passionate+kiss+meaningPDF 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_off0000c32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32F 10396 bytes
SHA-256: a3847aeb9d89fb467a8eee20c5de439e308d01290997a625bb68b02b1a811b2e
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16108 bytes
SHA-256: 8b1aa9b9b1580edb3a4e02196045d6d2ac3d0cc315d4c059914ffef44b52a8d9
font_02_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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