Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ee6f7634ba75db…

MALICIOUS

PDF

71.5 KB Created: 2021-09-10 08:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72c16316ee355fb15cb79512fbe3fc23 SHA-1: 569eff53cc4587c4fe16e893d3c35552bd20672f SHA-256: a5ee6f7634ba75db71a58f2af92d3f96696516b9f3bd23344e6eb6fcad34e587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. This suggests the document is likely part of a phishing campaign or a distribution mechanism for further malware. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=words+starting+with+a PDF link annotation
    • http://reklamavysocina.cz/UserFiles/File/86384956394.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/42362372488.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/fodita.pdfIn PDF document text
    • https://digireg.nu/upload/65689185189.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/1244575393.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5f7b6246e55e0d75c67d45fbf42978da/24392021445.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/18f511d1a4a1e5bf42153c6261252483/tulajatimelabodipojenobot.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/13270941461.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/40808361651.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/42812960315.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/dowemumedozirimudewipo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16138e2a86205f---321649866.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/jatagonibevuzugoremavuz.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/5567250796.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/50564168586.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/zomoboxexenefurid.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/70313362082.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/supudawejofutivejag.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/wifaz.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/40186224968.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/67021464792.pdfIn PDF document text
    • https://kaimano.it/file/80565480181.pdfIn PDF document text
    • http://gardatrans.com/content/Files/sawaxaguxo.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/53861161219.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_off0000b833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB833 10428 bytes
SHA-256: 5f395ddf49e0e83f3c6e1d9fc9466904abca16fd96d75c6fe13a67e0cbb6b728
font_01_sfnt_off0000cf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 16100 bytes
SHA-256: 72e32792782af70f28665e22a285b48de3e68309991488602bb984db7ea54d52
font_02_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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