Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e1724021b15122…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 01:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fade25117cc6a794c13b41c84eba99bc SHA-1: e8ca1f7d416d62061747f2f2860cf6b455a6c050 SHA-256: 27e1724021b151227e6038952b3d1ed12095ee395dd8cedfa2962e639a9f540c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tchid.net/userfiles/file/nivazikeneveriwugenizo.pdf In PDF document text
    • http://hainescentreasia.com/images/file/nenuvizobobazikizadogep.pdfIn PDF document text
    • https://heyratacademy.ir/file/9165450151.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/mojaxawafur.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/65350082340.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/j6vtq2rr6igrfcvscn5tm2mcha/84883971733.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2c049644---xekutojukifuxilewufa.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/koxipojugekegekaw.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ded407bd49c466966e8831472c7be37f/pitaxaxasixag.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/motaluvuzedagoba.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/asm9nhsaknsrjp32lsltefakl0/tadugaw.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b5412f461---fumituzapinebokomof.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3f76c4dbab9a760ae07cb0b066da79f8/sofewoxexu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7im4re912mkjkqhepjctfhcbr1/66811294453.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b7b441bbcec36998658341130c581484/fokiferesobi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce22f2a66c7---25851439693.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cd0a2d12c18167359eee5367b0db035f/32699715455.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/45895851480.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa0fb8257---wifemagolirofaroj.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/29144022227.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b661d9492---jananamuwuvexegosoxoge.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ebe78070e---mesuzadunaxikofe.pdfIn PDF document text
    • http://myphamasia.net/upload/files/41587714128.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/jefev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+your+true+zodiac+sign+book+pdf+downloadPDF 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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 18532 bytes
SHA-256: f5136d0eff3f92002ea53e25c961e33a58e0ccaa6b7434db852cad106882f4f2
font_01_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 11484 bytes
SHA-256: ca8c83f55037a3aaf95bda9f0fe057fc807e3afbe1e52699329744053607d27f
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1