Malicious PDF — malware analysis report

Static analysis result for SHA-256 add3d945c62d7cf7…

MALICIOUS

PDF

78.8 KB Created: 2021-06-12 20:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 940daae0cf5f5a497a6807cb8064c207 SHA-1: ce4b39fa3b1516be7db967ae0f3da004ae39a71e SHA-256: add3d945c62d7cf7435edea16144bfaeb5bae8c071165020ac87056820dfa3ab
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the 'download button' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=mo4+mobile+movies
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/egf4bip6r6resqqn1sshos1i0f/82319391117.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/991c67713cb1d0a46c5b153b1b140844/65841123478.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mv7otacjclb2v8qv38a6rk338t/tilalakededuninarizin.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/52503ffbe1c295fa672066e93fe507c8/92068207826.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f952cd6f0b---80874411073.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8bcd3770---54901150517.pdf
    • http://mulroyenvironmental.ie/userfiles/file/fizifuvuvujedapubolaza.pdf
    • https://ludifrance.fr/userfiles/file/15150092185.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d281531b1---pakominemovedesig.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ed5bde2ac2545007edabef8871e8ea24/gujoxaworunawaxibalo.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4da82ba8---34867767803.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091428f74ace---16278848606.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e99be03a2---62556306623.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d433fe5338---nujonugujet.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/53acffd86df0056ad17e0801f8c651b6/jegejelofitogiloga.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160864eb076eb1---detizijibirodotuvujajixik.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160929e6bde8bf---rafuxugovilululuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35f.bin
9d48e8b21be8702783bd074e4253b163ce3ca530f8bb28c8ccec6af17526af56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 2856 bytes
font_01_sfnt_off0000ed83.bin
795e5ad3817a3242eb7ae64ecce2b7b7b6df8644c8fb551b053d58eb94d0078b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 4420 bytes
font_02_sfnt_off0000fc91.bin
4b9b8c0537c0a02d2d2c3fa198fda7da80d782df11a8892f8b58e8646226752a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 11332 bytes
font_03_sfnt_off000122fc.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 4324 bytes