Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b06ef2d19d61ca1…

MALICIOUS

PDF

111.2 KB Created: 2021-06-20 21:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b06bfd1a65151dc92c96d334f74671e6 SHA-1: 8f050349af01fc883e554d0affdce437c932cb42 SHA-256: 9b06ef2d19d61ca1d2ad01813b291d42af734b82c2003d940ef1c6f83f6c40e4
196 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=kaplan+advanced+math+peds+a PDF link annotation
    • https://akapacha.com/userfiles/file/lumipa.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file/%5C/turotonovujuweg.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/tagagupenubipukuza.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160772cf43a469---safoperijo.pdfIn PDF document text
    • http://flexa.cz/docs/file/49792607101.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086e854561f7---wiluwev.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/94d43147c28926d54187553d43cabcc6/muzusupunorasolasixus.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/dbjsnclh0ufm2a8jrlsjkoeef6/razisefuzuluzavizedataz.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/ruwonagofekovorabetono.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b3f5602c---wakufiwojuxajudoromufe.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/69omtlsc37m3edtdheluijlh9l/46430287755.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/57302642573.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/gv8d2h312em87u16lrpoevfl2t/tozijupijodepulap.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aceacae72ae---82387757347.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/tafipigifo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e62bc64f---62639790732.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_off0001689a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1689A 4876 bytes
SHA-256: 82e5b6f0bed1421643f0dd6770e884c10f4e7f89e646375033ffc67f75e914ff
font_01_sfnt_off00017902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17902 12384 bytes
SHA-256: fb055ea97f0fb643a7767673bbc8dcb9018f226575a845aef092b40c212ef354
font_02_sfnt_off0001a14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A14D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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