Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e2e810fced45ca…

MALICIOUS

PDF

82.9 KB Created: 2021-07-01 12:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29a5147daf0048727d95423bd7d14311 SHA-1: 8d04578723c3a381fb2293ea28583bea1e452c8a SHA-256: 83e2e810fced45cab89ee1ddee41b7385375241d49553a6d04dd1726cbc62734
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58403cea771c2db4b3ee1cb428cf72a1/zosojonuxudepodusek.pdf
    • https://bamfieldrental.com/userfiles/file/puguwonokakesoj.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3d21725e---70572224105.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8f6dae5a86d19e25b19c7f5976694170/segoxiwedut.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609223afedf0b---36275745967.pdf
    • https://mytopics.it/uploads/file/kavufegidowogibugene.pdf
    • http://animationcoach.com/userfiles/file/jakobifedazumogixefusago.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad302ba654---pezujudotonipezow.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c9e03fbda762a3add152acb03b35c257/maleguvit.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c1b7901ae---70396222634.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/898640710dfbd8363627eef930ea298e/zadogo.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d68bef80---mikabela.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b052c800ad8---79879344090.pdf
    • http://usaoxin.com/userfiles/2021-6/file/gazakisuzenason.pdf
    • http://autoscuolepintozzi.it/userfiles/files/kegefokuvironubovovejifa.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b00658dc6---88731400738.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160978f980a78f---83581501525.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e32449aa---bugujebunekox.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608569c8d8bf2---86882043046.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c93d7042---mitodav.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d9bb09d4a---wudonivirexatafo.pdf
    • http://daimarconstrucciones.com/images/admin/file/neposeg.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be68bd26429---kexejixuxujo.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cd9d203b9524926b76820dc009b389a9/7602720041.pdf
    • https://aymsoft.us/aym_image/files/4422634949.pdf
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/69358885220.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=biophysical+chemistry+cantor+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc64.bin
d04808e9e0816e6c4781049e49e5b189ce8b8b68b4919183abcecc8ff961543a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 17500 bytes
font_01_sfnt_off00010a1a.bin
42ed0c81d1e0a952081c5c4f11ebcf6ce53ebcdd1603a89cf084c0107d52d8ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 11140 bytes
font_02_sfnt_off0001240f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 16792 bytes