Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1a178e76519b42…

MALICIOUS

PDF

74.8 KB Created: 2021-09-28 23:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a54ddb23a6576681baee0a07e03d8b4c SHA-1: d6ac64516b683bc8ef24720d5623d069540a679d SHA-256: 4e1a178e76519b425ba55bd5599fb38964625d705123943a9c0b2f6cc858d8a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://interface-referencement.com/userfiles/file/zifogujovuxejegigafi.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/27f028a345aece43a7c1c9feabb1edee/394808062.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/55890885503.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/20656401054.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5c5673d166d1e1931fdb7a56d377a6ab/vazojisogez.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/13191019338.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pinazorixirekadimulajazum.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/54b39b31505f2e9855ae76f2b9e233a3/pekenex.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/vupejutukozakiligo.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/71511185462.pdfIn PDF document text
    • http://www.grifin.sk/files/zaruxiwabedejokiluv.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145f40a524d0---43078297083.pdfIn PDF document text
    • http://speckrepej.com/upload/file/35831621672.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210927085718.pdfIn PDF document text
    • http://come2menorca.com/images/file/57921385796.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/likakabigiwitu.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/sabosuloponewupex.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/63541237597.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/37013800706.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/tujovuferino.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-16/20210916161403265918.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/penekutolowarisudatidukux.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/37735619187.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/nogonatojidejuvogomixe.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/nofufikizajotasal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=film+bhojpuri+nayaPDF link annotation
    • 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_off0000bd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 18636 bytes
SHA-256: 688ddc4f0d8eaa71a598eb2cfc290536b9bb44010dcfadf5d39fa856d8c60c36
font_02_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 10580 bytes
SHA-256: b66722271741b9a6b0325b98443b38b0e0278da3dffe4575fef0cf53a34b165e

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