Malicious PDF — malware analysis report

Static analysis result for SHA-256 b466883180b83475…

MALICIOUS

PDF

92.4 KB Created: 2021-09-06 08:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a93a085216ac097ca56cd9fd11036d05 SHA-1: aaa0c2a1b0d94d3be7d43a96976dd92c47b938be SHA-256: b466883180b834758c4d8d945a2842b813b20414fd338f43a563acc99e24a267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://voxel-avocats.fr/uploads/file/zifuresezo.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/462af7hljusii6hq7sa806d3b4/49407994954.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/74236712055.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e0298b147df328a10d1f815d17f851f1/moloxotas.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d12c9ed5760614dafbdf69995ac8394c/diwaxopin.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/48757254316.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8eb5e62537---siziwurojadipabigowij.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121c1be81ed1.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/25349722623.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8fr8o56k9bdqbgojesq9p750t0/bixaxevape.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160cea59fb33ca---71014754069.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/10866340492.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb74f1d526---40147630329.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e2bb3ad5b7e83cc23c12222743a1773c/jemetogunasaduseda.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/39771605291.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/1746005576.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/57728605046.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/03a2b9a6ebea8899a639e0baf924cafd/78791915647.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8c595ba0c24348e0dafc74a40a7b7b03/16069575714.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/p2lf3b79olooek86p802tbd543/zewus.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/jipin.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/bevejozijemitapir.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5561e091---vulidovakeguvatunob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=full+speaking+test+ielts+pdfPDF 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_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 18408 bytes
SHA-256: a6c69127ea45a9842908da15c241e766e804260c0b449a7c82c2d51d9ce6ee0d
font_02_sfnt_off00014baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAA 10624 bytes
SHA-256: cd8bdb3cddce8ffa33a4c4c450f27a1282a63fd427851bde55bf2f1a4ae92053

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