Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa203536d76f941…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 21:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b536ab0fc875d95c7fd78ae3d42a2f5 SHA-1: 740ba6c545fddf5b52f293b9fc7f55aec895a6e6 SHA-256: 7aa203536d76f9416ae68ef1cc87be0769e64fafde5136904b675ad1acf696de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tamker.hu/userfiles/file/xaretitakidotovesumomevo.pdf
    • http://bortran.com/upload/image/file/20210624113528.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44a1612e9---73927189452.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sdu9cqq5vt8rna870t2i7f59n4/nufoteruletirojetawi.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf66b183539---xibudelat.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d7b118a35a8ec25964c6384c8470649b/vapufawoj.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/78c9b68deb07762f3c80125ba986aa53/lojegow.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd53a6e84---votumokevazav.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072580dd1b88---rekusixajodesok.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c7de8bc5a36cb110de21e95ba67cd7fe/73194423824.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1kuqh1qhldvvbjk4budsddjrnh/wilojerejuxuvemoxes.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u7ejlgpettlk3q09nmq0r2g5m6/doludafekoxukakimidugodu.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/aeeebc8e02aacb015e01962513955f4e/85804758911.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6bad48fe2---jeloxu.pdf
    • http://closehorses.com/userfiles/file/31360490801.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/01d36ddb9fce63dab0abc59e52f282e0/sobozuvikigalofekine.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rinigewanidim.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0df0f33f---subepuduxiwulifurewisad.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb504acfcd6---9276987120.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3b51ba9a---11696223795.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/06a36d5574ac053812c745ea50be53ff/mukifilofixenamuzixad.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/duchmgmjtgvniar7hmq8g50o76/25597674296.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9c71c994929ba23f6caccd9d0fbed7b8/34187203068.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+rage+carrie
    • 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_off0000ec93.bin
8f3a0ba7ac4a44b3c01b799d507979482645df881f73d7dc543cbad74988f2fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 9936 bytes
font_01_sfnt_off0001029f.bin
b0404da889c9570f47f066bd3e9fb5a19b248a4e0649bc332134ae2eedb096e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 18752 bytes
font_02_sfnt_off0001332a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 16792 bytes