Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbafd88e2e7281a8…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 12:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7136f924f8420b928caf62515f009493 SHA-1: 521dafc5b17055a3e9c7f4a87acf3ce72e2ef47d SHA-256: cbafd88e2e7281a8758542eb78c6245c8f28b6d4965182faab0984f366c5ccbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=leadership+and+motivation PDF link annotation
    • http://ahlhy.com/uploads/file/140500125530.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/p3jpca21a2qja6bf5qmjsqper0/gawakivijesexowinedomiwi.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/i29s2b1sla6r46j5hdh7rk7u2c/jalimot.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/vomesizusitalonewixa.pdfIn PDF document text
    • https://educhina.mn/editor/files/xapizajurikarafiwomidugi.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/besakajakagurewujozos.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/94946145607.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0f8dee3e57d6476f0dd1ada8f5065fef/ximikutebosafikojafe.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/32477155251.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/e199k7h24ae8pihnnr7lph0bbn/bobibazudet.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/mozop.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fde661c34be1783f7e7cf96ad937240e/99075978711.pdfIn PDF document text
    • http://konberdbio.com/upload/files/vevoribom.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75e5bb3f14---17629653903.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/01fcd18a557723670c2e9a3f5bb29b03/zopevodazaxumudaxadifida.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/biwekefevirikinaxikevevis.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/33137901751.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/sojirurezaduzemuju.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/7430650821.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/10863688023.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/wejolilakururile.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87780a8f88---15398547416.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_off0000b23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 15108 bytes
SHA-256: c5028f813237d87b9b816b37d2c679d01c86b77ffc468eb31fea00b6a7da5c4d
font_02_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 10636 bytes
SHA-256: b1e5f7bc0dd1fd74505312b66b201ab35f27cf8c7ac396630f876c5b2c90c0d4

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