Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1334ab602003c40…

MALICIOUS

PDF

73.2 KB Created: 2021-09-24 07:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1d81285fdba313656a6f47e2d539a73 SHA-1: efeb512fefbcf6c14ea7e7fcfed5a8b527212d5a SHA-256: c1334ab602003c40834236fa0136ad09a5e67c0b51b025b5c80eab42ffb9b4b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://ketchas.ru/uplcv?utm_term=tweakdoor+video+star+android PDF link annotation
    • https://mabuksusu.com/contents/files/sumakodabemif.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/25211980659.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631841110433137326.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/mujejepugunegakatu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b61a4d06a946e53aa81dcedb8be84388/zugexafuzowiwasugon.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/xavuzuwexopomonavet.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/zamimebotudarawigipesus.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/pitobunuwojemusid.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8a08551b---pofofopikunagoruwumek.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/fijolinalejijijuxinonen.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f0fc0434---bavowiloparovut.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/muloxaxozapuruji.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/jinugumitenaxifegifete.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18cad0ea3---jovolenejagowuzevositizi.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/dejemegesugagerilizaje.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a52821ecd---53475298122.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc300367cf---38079757542.pdfIn PDF document text
    • http://alidongdong.coco1490.com/upload/file_folder/file/35427999646.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/5193846756.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/61085574841.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/73493117394.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/94056697553.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/petogul.pdfIn PDF document text
    • 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_off0000bcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF9 16492 bytes
SHA-256: c7c9a2063c6e674f141d52ad0d89e00e71bdb8e78f7b0611af1596473e6897a6
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10400 bytes
SHA-256: 930ff1e381a8e995b237d45aee125cb6c644c4649f0526f70db30130aef163bf
font_02_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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