Malicious PDF — malware analysis report

Static analysis result for SHA-256 246008e2943010cd…

MALICIOUS

PDF

63.7 KB Created: 2021-06-23 12:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 58a8bed671776928e584e778dfa64a37 SHA-1: f52f9f03c326838cd40a6a122a23ee7ad5e94eff SHA-256: 246008e2943010cde3add3110780c13eb9c5ca6e10e72df2504cc7b3817f1671
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and contains garbage data, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=thesis+defence+presentation+sample+ppt PDF link annotation
    • http://ergo-logo-bamberg.de/userfiles/file/60099055815.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a5764c3---lamitesozujibut.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/86u8hrtf4rjkn2ffcphoaknf24/3220887664.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bmp0u5u51endpm75q7utsr95m4/6754551524.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/monezatupudewejexixuxoki.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o74r5282716c075f9aaq5emv07/36150685245.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b88b7b644feb9cf8ffd083ce6fd9b3a5/68288869497.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d4ac970e2d9fa15ad5ab9bcae2d77275/89648013849.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae9363518---50247921203.pdfIn PDF document text
    • https://tavio.ru/files/file/gasibogukegepabinupiv.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87fe455a7---godotebapoxur.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f8fff59ddcae6adf1b5903e75689eadb/xijebipakadinuliruwagafu.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/82042138037.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/juguwodaxix.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088531c5752a---siwufesazokolaxis.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082f7acf2d---lavewogodeliki.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/34018786766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 5344 bytes
SHA-256: a29f70d89a14a34d5bfcdda993b162c0311352a44971774a48658689b2124620

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