Malicious PDF — malware analysis report

Static analysis result for SHA-256 149c64520e0487cf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 01:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0aca1164ca06c56c2408b3197315a333 SHA-1: e604de0d2ca358936af4fc6dff2f4cafd0345138 SHA-256: 149c64520e0487cfdf8c333f77493fa5a1d719c87e4abcd3d30b797e7bab9773
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous external URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://ibtaker.ps/userfiles/file/1753969411.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d5ebff49---50439439416.pdfIn PDF document text
    • http://htygroup.com/upload/files/wezowasejanivinuniwumu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c265e512d4---jimawovagubefuna.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34cf49981209410c9116e9d177b4ba2c/79807841360.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/56137354680.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/94316867686.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630339295.pdfIn PDF document text
    • https://kede.org/userfiles/file/3987696509.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/96825821275.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f05467d25bab0e8345bd833c5c1e1b32/kaninajusepajazerovajilo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/vawotimijujedovumotobo.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/rn2n4r64ii0go6dklv5nob7en4/40139524342.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/tofufeg.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d2b0a14d0---32697049584.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ad591052a1a8e553d4bc59ed81958fb3/wagewazukifivawaneku.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/56765478036.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/nipalafamegapevaguzoz.pdfIn PDF document text
    • http://vizcsap.hu/files/file/wawijidowotafuwexazu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/nekuluje.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/warodipoxorigovuli.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/suvugeximekodisopunisaga.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/623147fb19020458c43d38482e51c138/38842950409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ficha+anamnese+podologia+pdfPDF link annotation
    • 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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 19840 bytes
SHA-256: 45dd6a10b51b187056025bdebfbbb4e44327abe783dbdeefc6fc0e4b024f25ac
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 10844 bytes
SHA-256: e8a0be046841f6ffb60fc25a18e030f0b6016cafcbf0e5401c928ab3f9cc9d51