Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc530f35585d421…

MALICIOUS

PDF

84.6 KB Created: 2021-08-15 15:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 200d247c05920027517377dee67602cc SHA-1: fb896759d56e7a12644eb6ae6419fd09800a9e9d SHA-256: 1fc530f35585d421ae035e60565713eba48ba30a41eba7b5cf9c711fffb9bb2b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://tekmaker.com/upload/files/mukakosofemusasudowalis.pdf
    • http://acpiindia.com/userfiles/file/fopazo.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b84717c6200---99649468307.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3d6b0fee---walidupitiv.pdf
    • http://gazosilikatnn.ru/uploads/files/11270385730.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16078207a77d70---romupibuxo.pdf
    • https://noddy.nu/images/file/sakira.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3e20e3558---vebokalefujemojusageto.pdf
    • http://architettosirocco.it/userfiles/files/rebewosilemibusavetixus.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51d8e2ab8---48828014876.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844eb120806---7325632084.pdf
    • http://acsalma.hu/userfiles/files/67558749436.pdf
    • http://hopkinshigh1988.com/clients/75739/File/tejixebak.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa867c72b3---salutoxig.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c0f9190c1---kofejija.pdf
    • http://esebtekstil.com/resimler/files/tulawawevowuladubezud.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a97347e73cea4ad1ecf0514cc89511d1/vitugokubif.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hstn2ijh499jn6bfm8f812thgp/zoluwupogusuwokepulalojo.pdf
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/xafisisalaxakiwexadakoda.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/47t7r8188t5c5lj7lt3d4tsap4/lunuvadekunejeze.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/3b0d1c71d1ead116ebfcb889561a6347/64928236790.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfff4d1ac4---bovegewipotatos.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084110e4bfd9---40827437820.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/gevifura.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=python+selenium+chrome+options+list
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d060.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 16792 bytes
font_01_sfnt_off0000e877.bin
517343722423388b7dd4f558f91c64b81f2b819c36d8718734ddd8a8e4dc1803
pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10692 bytes
font_02_sfnt_off000100cf.bin
4efc2a42b8b88b3c9865025afadc64e4280e161f902ca8fb00ccfd37c32cbcda
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 16952 bytes
font_03_sfnt_off00012d31.bin
22e2deb36a0af02c87abe2ab0eca6c71cc47bcdbe9f50b81eeeaea6b757c8c43
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 5536 bytes