Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d767c4a8cdf8934…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 16:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 495c6526f0879a98e93e375446c546a5 SHA-1: 923d77a0b42822323700c7cbd639b3cfa67300d7 SHA-256: 7d767c4a8cdf8934d5235d6d5371905718bb72ecc3d137f26c6c6ba746c2719a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of multiple external links and the overall heuristic firings indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=fusionner+deux+fichiers+pdf+gratuit PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723bf7e357---nakeminimu.pdfIn PDF document text
    • https://777mto.org/contents//files/2151256509.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99608220b---fazar.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/25572587355.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/totanevosevugur.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/92222465939.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16116bf3eab31e---beburekizabejukut.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/vexadokabolo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gfan8kg16qgmr446fpnpbpljv3/15897623395.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9091f188---pogojom.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/10182832720.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/batetekalesixiloti.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/70739218241.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/jixowokedikekopekeg.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/sesadupitukidawofawiju.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/93412430569.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0937723fb5720107763edceae2729922/sebaxexujufi.pdfIn PDF document text
    • http://614move.com/clients/4890/File/pozarek.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lojamovezesatiwonexopamus.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/tazajumarifewenunusemoru.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/losujuzufula.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 11032 bytes
SHA-256: fc5633c480a24d3e60a14d097f351242bb69da5dd4239676307f558f0fe639be
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 19376 bytes
SHA-256: 4d36fcf646f7bb51b01df305a183724471d7fb48ef65f2f047463ae3b929fdef
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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