Malicious PDF — malware analysis report

Static analysis result for SHA-256 73819d563d5e9fd1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 18:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e14852440ae68f692a9a066baa9aa92 SHA-1: e6e0818019c0085576bc7defd373fb30d93dd318 SHA-256: 73819d563d5e9fd112462fd7858e113f966326c4ddd5fbf6f9c7818957953393
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, while some are benign, contribute to the overall pattern of directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.ondebiz.com/userfiles/file/wowonuvidit.pdf In PDF document text
    • http://lejonhund.com/upload/vutifisupevanogafi.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/27422101538.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/davozafexurumekominuzino.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5dce79780---22160625997.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/kutok.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/83730801017.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/736437a2ad49daab20990e462b168304/gisizukemipatibavojaf.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c0eb43777d2f4606ff52a7567cd388dc/79294160050.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/takenewinupetizu.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/banidefitupu.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/xonugonurif.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/nuxenefosirozomu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8bb773ff7---wiziden.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/wadojipukasofegezef.pdfIn PDF document text
    • https://glozor.com/userfiles/file/buxuvobudusivusidamafodi.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/75281474835.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131551780778---19581866365.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/bivasulumafexikanosaxoten.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db59e0128---76588837469.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/42388809299.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pofefulupoduzobogaxas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=diablo+guardian+xavier+velasco+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 18824 bytes
SHA-256: c7f0b7ca29013f2d3536a7d6fcc3762d57473f6dcd41d9a4f4938aef38acb65a
font_02_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 11108 bytes
SHA-256: 959580fb38ee65de29784fb282d962226ea965c011bb9d556c8552c22cce7453

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