Malicious PDF — malware analysis report

Static analysis result for SHA-256 a169a0227de075ad…

MALICIOUS

PDF

83.6 KB Created: 2021-07-16 09:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: beaf9c2e43413e9e2ddf7b3e7a0389f8 SHA-1: 2f37ba8e62be44c9bb3170329bae1211ae999597 SHA-256: a169a0227de075ad6c20cc20b4f94d0af6edc786cd5b420a4472ad24109b3782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure is indicative of a phishing or malware distribution campaign, likely initiated via spearphishing. While no scripts were directly extracted, the heuristic firings strongly suggest malicious intent through the exploitation of CMS vulnerabilities for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7141f5592dd6616586e95558b45b0a09/83772162002.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea4738e45---kixunemures.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c97dfaa9634---vebobuginenopexegix.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/nmko94hp2j588r0pn2rsr6pvl1/25560049313.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9903e7eb9---81178291443.pdf
    • http://akkoryazilim.com/userfiles/file/zuxakawomulusolujowujudu.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/rozulinupokolatosux.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/035adaf7de0858744ed1a63751297dbd/67681108751.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/b4d802877d1ae946a21ff09f4ea12316/52517720395.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160805d9375d95---34972890476.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jr187rlc364r0f44rnforuljn7/98384304891.pdf
    • http://lhs75.com/clients/46937/File/vudosiwaso.pdf
    • http://tapetcenter.ro/app/webroot/files/userfiles/files/43391954489.pdf
    • http://neonyazilim.com/images/Media/files/bavetagesux.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16095812b6444f---29595309132.pdf
    • http://wildpflanzen-planung.de/file/12728980980.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/nozojikozenukudufezavuxov.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16199144705924.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec766aafb---63123232518.pdf
    • https://t2sc.me/userfiles/64790950101.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8e0a988c269cad0a8b92b27f6a885ee4/59714327738.pdf
    • http://cesishotel.com/res/wysiwyg/file/zeronogopefiroromu.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093549f24734---1677495372.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=uric+acid+in+hyponatremia
    • 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_off0000e590.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 16792 bytes
font_01_sfnt_off0000fda2.bin
6b3c0ad25757853ecfcc53dc859d327a054efe1e364b743d56e76aa9d422a8d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 16684 bytes
font_02_sfnt_off000128f4.bin
5eaabf99558976bc4b7ab02a28d8b52a0dfe1bff397cef84555c6339f179d099
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 10688 bytes