Malicious PDF — malware analysis report

Static analysis result for SHA-256 407453538a959cab…

MALICIOUS

PDF

88.9 KB Created: 2021-05-25 12:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8778962017b6e65f68df7f3d2ccc977d SHA-1: 13510b58bbff8e9fb17d9d9135d91fb6339dd6b3 SHA-256: 407453538a959cab1d82fbc140e55f46b2810e237dcafc078c6fcccf0fb47bd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/uplcv?utm_term=what+is+the+overeaters+anonymous+food+plan
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c960f7da11e52c0fae98a4c0bf4b4fb5/vezopowigus.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8a2af22db816403c0885cb18a96ca78f/11542425647.pdf
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/2bdfa0cc195406d838b5d5d57bd45312/rosipimewodasejizamajobo.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cdfe0ac3---juvuwutijidoka.pdf
    • https://betenenergy.com/sites/default/files/file/tojewazezeka.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/86a37751af908831727f3bce2f6a0351/2926527939.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16082801b9b6c9---lufaxekud.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e37cb89232f329007b403c5a470b0798/47032343555.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160904699268c7---dijup.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa583243e---76908602121.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5b751923---42323409263.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6c94b143f---zibidokor.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/88ef8258a23228184cadc746c9b2d2f3/54225161415.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2738410149f2efd0ced7d3a08031019e/94320687576.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/j7fhsp0vks89q8h676j2i8nv3u/82409445531.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e3js24mcs86bgepm5tldbagbi9/fitafekoziloriporiwi.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17d5b7270---xofewerajawepikazejuwi.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82734587f---62833423014.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b58.bin
c9fc4e2ce4175609d6429d9d6b0450fc3803b4a2a38efd6e59a6da226ce15664
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 5456 bytes
font_01_sfnt_off00012dd7.bin
8feec0f83a988dd364e6e616e338200ca573adbb6a9c0813a78034dd2ec722bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 11568 bytes