Malicious PDF — malware analysis report

Static analysis result for SHA-256 78aa0b0a35716fd5…

MALICIOUS

PDF

83.2 KB Created: 2021-08-21 17:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f86568951a2ce5069146b88ee5100b7 SHA-1: ec4506b73760cdd8d88eb9208329a5bbda990094 SHA-256: 78aa0b0a35716fd58f74cd3e59c62b0c79f812517d114949b6abe45e10092cac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation campaign. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=how+to+add+amiibo PDF link annotation
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/42c6e0d67f808b6a8ec137316ff4ab6a/5149107986.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1722640957---roxogijafekudi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dd2ihn113r2rqcu7n7oucfrr4b/56953177374.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210820043312.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/13210821604.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/44184094371.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/gimugudix.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607662999a6b9---tomaliwetepos.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/34659398040.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/xonedixopisawazinoxakajos.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/sutavevo.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/pafobetafunoxap.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/43721dfafaf556ebc2ea5eadeb93b1df/2524311034.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9256dc3d---tezetaxudatexefag.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ce7f994ccbe7cef181d83c0ed4e34013/26703109277.pdfIn PDF document text
    • http://caramelitos.sk/files/51942698807.pdfIn PDF document text
    • https://nyig.com/files/file/12248078325.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/noralor.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/67606381879.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/xofudimuzu.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/4qs04js2jjl4skhlecn94b4of2/guweninelujobu.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/28572171503.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/40433664835.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/siruzadebotusibelusepe.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b895bc8ee08---kamokevofimiwodasawes.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/tirop.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_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 10076 bytes
SHA-256: e5a494130bfc2c5bf6071caca4f8c7a6e296a694504613d4b1ad2256a3b1b360
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 16664 bytes
SHA-256: 45e1794eaba00d261967791eca84cb3268c4f46f1b4eefc18a61a96859ef99aa

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