Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16f3234dae8c740…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 04:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 463c0c922ab0322608a17f385cb17c90 SHA-1: 1e84dbf6c4b7233ba14dac149cd27297eb22c5a8 SHA-256: d16f3234dae8c74046b11997c004312d4f59564d3ca7de085e836290199c0d75
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the document structure itself is designed to facilitate malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/11beab78502fd3790cd1cd9c49a0093a/62239204082.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2793e11e5a97d54c063b73c8178f36d5/12898069240.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/52281271435.pdf
    • https://costarica4d.com/contents/files/96333066972.pdf
    • https://www.aicsmindia.org/ckfinder/userfiles/files/merosirixowez.pdf
    • http://biswasi.com/userfiles/files/bivijuwudevatujev.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fobumoveriw.pdf
    • http://2m-m.eu/userfiles/files/pedorubafepej.pdf
    • http://abwnickersonplaza.com/uploads/files/rimapokimazopaxa.pdf
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/68699328167.pdf
    • https://pcetravel.com/files/file/97771762825.pdf
    • https://migger.dk/userimages/file/mitotamimemosegemim.pdf
    • http://foodzipo.com/uploads/userfiles/files/77958831045.pdf
    • http://skinct.com/upload_file/file/Fl202109172303417060.pdf
    • http://pobierzplik.pl/uploads/files/57827709627.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6ff2a4ee---gomixuwajogovunun.pdf
    • http://urs-certification.com/gais/image/file/56899169290.pdf
    • http://yogo110.com/userfiles/file/lukone.pdf
    • https://ceccarmaramures.ro/userfiles/file/togesanimazigupavidegefo.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/18a6b0c735f98439d75524f196727849/39220391071.pdf
    • http://ubytovani-budejovice.cz/picture/vtextu/file/65561496330.pdf
    • http://grandinhr.eu/images/user/file/ponutamivi.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/30591833395.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+mico+live+mod+apk
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/semetoxepawirajamexopixe.pdf
    • 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_off0000c255.bin
cf87d7bb64cf1814e3aba824cc7113fc03dde466df3f9cfc761e43411a6667b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC255 16920 bytes
font_01_sfnt_off0000ee46.bin
9d4019be22d239e0854f90647a787e3a00e3daebb8e57233c96fc7125e72bd63
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 10556 bytes
font_02_sfnt_off0001064c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 16792 bytes