Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd65ed1ee8c22e2f…

MALICIOUS

PDF

86.9 KB Created: 2021-07-28 08:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ed4c818752416382410795e6beb1026b SHA-1: 6fc2fdf3915b5082e324794d003bae0ae4b51558 SHA-256: bd65ed1ee8c22e2fe4cf86a79a267ae0a6cad8804f21b887930f45aa7b567d8b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these link farms and the overall structure suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://zaun-produzent.de/userfiles/file/16193390946.pdf In PDF document text
    • http://goref.ru/files/file/19057008208.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ec98cf4b2d3---bosejodezepulad.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/53968784700.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/23087395166.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfdbc17e5---wizolopatoto.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/51112269239.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/jesijikisuxuwudanukak.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9cc7fe2b---79339528996.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076592a9abe8---39881846427.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/22833292098.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/rilatukotir.pdfIn PDF document text
    • https://brickzoo.it/file/4171639977.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cc619b1c5---foluwofumanafapeladifupa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076b04fa9abd---72026604946.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/cf287ad81a1ad85bb712cc4525a4f183/besidig.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a4301b7d1abdc284cc7da2cd5b3226f9/12554870243.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/67437616412.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/42172968423.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/sokatavevisuzifama.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/6221577237.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/80933570405.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/87396966863.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210617182558909.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/58380545256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=standard+colour+code+of+fiber+optic+cablePDF 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_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16544 bytes
SHA-256: 966ba7c77e7a2f2443f06c1850fca32ee617f7983fbadeb599bcac9dc1409b19
font_01_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 10760 bytes
SHA-256: 4e1fda20df4ec90f98f3c2919c1b51fc8fb9050a7971489547d51a52f3c9da28
font_02_sfnt_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1