Malicious PDF — malware analysis report

Static analysis result for SHA-256 b878656aebf72393…

MALICIOUS

PDF

79.0 KB Created: 2021-06-09 00:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7e19f52e39e7dec6df3a75787063c1a5 SHA-1: 7937ce499035514850c0fe31fb4f64eee9ad62ba SHA-256: b878656aebf72393f8a95e307ef4801023e5cb94393637ddef49d34949b16df1
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though partially corrupted, indicates a lure related to a quiz or question, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=choose+the+correct+wh+question+word PDF link annotation
    • https://ph2020.org/FCKeditor/file/66540540536.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46312501385bf29eca3d2bbd11c363cc/sijusisudumuparalupid.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sh36a29mtrk7h3jofnp3pvbu46/jixumegofituzilizejinimox.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/86340793568.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/20423128826.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e5608e2c6e7e45ed0ed5e20df9032701/41443504451.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/67218086477.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/65e037165efef3ad8d54fd6de777e76d/18918939486.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aef7d70211c---judunelurepakemi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b451e45b0---56781211897.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/matelobe.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ncsb6be7plrbtapnauoq3d8uo5/wobuvegiwevufanetuvosima.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8ca325fb6cfed8e0c774e81fa07bd783/jujuwijogakeweramirogog.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a0c7cfe1---galuwetufatibuwamexubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 4908 bytes
SHA-256: b2102f92b316761631393f71107231381ca807e632734e4c1f8c4958197e9a86
font_01_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 11136 bytes
SHA-256: 237b8b8541a77aef9095df1a475620204c898afecf831f90488b69b665be33bc
font_02_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361