Malicious PDF — malware analysis report

Static analysis result for SHA-256 732b2c652987401d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 00:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c398124cd92bbb1df6c40cd718050538 SHA-1: 438282c6b93ea8881a24ca5715d225d122596830 SHA-256: 732b2c652987401de583169d5befcbd6d94164bc5cfc85091e98e138827ae9fa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting it functions as a link farm. The presence of external URI heuristics and link farm detections strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=olaf+in+a+suit+frozen+2 PDF link annotation
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/176f1c5871b96d5a7190ee96bdafc547/xadikexezon.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/regezuledudagadabuj.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9d9f00067ea9b0b1dfd8f15b2e3fb615/durano.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6e02eb6c33313aba8496bcc4e438fec0/89001592327.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/lexirevukupil.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c0df4769e---xoxatagekajob.pdfIn PDF document text
    • https://diphong.com/uploads/kamuw.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/94366259861.pdfIn PDF document text
    • http://www.toptehnik.si/images/5566493485.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88288a116---44198097472.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/68396147645.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/siwilotu.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/kepakafadogofikular.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/fudutakuliwibibubanuse.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/tajojoniv.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dac3262fde1---98003872423.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2db226cea---felukanuxakugagirowema.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/19846482782.pdfIn PDF document text
    • http://intergeored.com/upload/File/2581540932.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/g4sg9h9bgm09svgu6gd218nt72/lololakaruderoli.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f073581e0---63004553741.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d032c32ec5094098c6c525b081beb4fe/61205089772.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_off0000c7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 10512 bytes
SHA-256: 68e4b83603a66bcdb6d8bd74661a05133a9918766b8698d92a70c644c5e62655
font_02_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 17788 bytes
SHA-256: 6e81532f7cbf5a4db0bb0d8d5f1593c83c4b373a75fb17547640519211f3283f

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