Malicious PDF — malware analysis report

Static analysis result for SHA-256 20400ec910220aab…

MALICIOUS

PDF

173.7 KB Created: 2021-06-18 19:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a326d384ecaaf16d4f110ca5c74f595a SHA-1: de6d312c39bac516f7811266ffff73c5dbe0e1d6 SHA-256: 20400ec910220aab0b8365a7f51992b59546630e6fcf0a15ae5c47b04e40e37d
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is an advance-fee scam lure. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the document structure and URL patterns are strongly indicative of a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5a4fa58c8c997c8243aa64aa229b4cea/16689016145.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5f47d5a54206405fa50732dc27c1ac74/lalisorisutizixed.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609887fda5ff3---90060283691.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/97554319994.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae672c016---pegawi.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7933529adb---64121363132.pdf
    • http://mlsconsulting.net/cms/files/File/meralusugowasojikasuxiveg.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c4aa85b2c0bef8c79d985eb89856f87b/99123371635.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b255d473c40---devimozijefigip.pdf
    • http://simonide.org/userfiles/file/defirenoxepofis.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1594044d8749384157553b6af9456981/balekelalexux.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1fff414a8c9b59dcbfeb16469166fb9c/wofogona.pdf
    • https://mmagame.com/userfiles/file/85586019999.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608236cdb9323---welakuwirebumudufuwut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+the+ramp+buggy+trade+price
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025e3e.bin
c305b61cfd9c33a33f48ff76926b700ed949e2a665479f6ee3c92f7bd30d73e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x25E3E 5348 bytes
font_01_sfnt_off0002707e.bin
a9996d1a9985e86e470e58d2027c7d08b4117aa57a08e6b30586934aa5d0b2b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2707E 12188 bytes
font_02_sfnt_off00029959.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x29959 4324 bytes