Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0f8d992b49f437…

MALICIOUS

PDF

80.0 KB Created: 2021-08-15 03:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf69be438ba20d970dfd09d7ff4abbe6 SHA-1: 936d4d6d212a49953c266ea83df055e891c5b093 SHA-256: 5e0f8d992b49f437a4e52c1eb309b4725cd877719e3cc2e5858040f460b3b876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farm patterns indicates a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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 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://krisoc.ru/uplcv?utm_term=colt+1911+workshop+manual PDF link annotation
    • https://floridainvestment.cz/files/file/bubiwumadufunedawosatogiz.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/na1atev6m07qrf9iaa4rlld6tm/zejipofavemegesererudorek.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a09f945a4a4---82055561194.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/79783499908.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/binebakukasa.pdfIn PDF document text
    • http://hotstamping.pl/files/file/7123103117.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/57bf5faa7de41bce4191e942d81da4a3/72409027140.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/24470737712.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da3ba6dad6---xalumax.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/6462561433.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/tokesiwasafajew.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/21777689682.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eb5325c07---5024102570.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/43fefbd43998ae68307df51460d306bd/zejim.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/16385958536.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/gisepetojezadodisava.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/67539984781.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7742016f9a6e8793a3a9a0547d46f1e5/xigaraz.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/kibafuxalabexawabemij.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/37qe5i7sv5fo0etihh94r497c0/levegewekosijovuxezobitij.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4e106adb6---59092722125.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/47428849140.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pewevipow.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160865afab4b50---jasigulafulewixuzezab.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a9f410ad---figale.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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 10824 bytes
SHA-256: 3b20793abfc19f94226c2a930b9813da0cce565453090297cc30e42d5a9f194a
font_01_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 16848 bytes
SHA-256: 7ecd092dded5e607096b982b898bf48c556b1651b888ee196528c7b80c8473bb
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1