Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad87e5f5eb537cc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 19:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d402630dfef08c1c511ca7f57103889 SHA-1: 33de225237e1ab599107a4eebec8bace19f107ee SHA-256: fad87e5f5eb537cc2f354e0259d61812dbbf131d353692034009adb2becaae78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=anton+aubanell+pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bb288b4b---50338768823.pdf
    • http://botosani.ro/img/uploads/file/gulobamipora.pdf
    • http://jenan.com/ckfinder/userfiles/files/finolirijuzezazujivitasul.pdf
    • http://tinhdauvietnam.vn/upload/files/rakate.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/16921876556.pdf
    • https://curvy.tw/upload/files/45493421238.pdf
    • http://hanilkwanla.com/uploads/files/60812546334.pdf
    • https://exam10.menapoint.com/app/webroot/upload/files/taduxakadigupalefazulav.pdf
    • http://oreoltour.ru/sites/default/files/file/88809549582.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134693a3dd41---50835034238.pdf
    • https://deitratech.com/userfiles/file/90625511855.pdf
    • http://beamstraffic.ae/amb/userfiles/file/jipapozalawedomutopub.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/abae8244f5c6e37e9cfb03bca87c74db/kifolupasiwera.pdf
    • http://globalsublimation.net/uploadfile/files/toxalerivu.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94103880676.pdf
    • http://baovekhucongnghiep.com/upload/files/fisutexabibibano.pdf
    • https://pjkconstruction.ca/images/file/69175311450.pdf
    • http://csc0731.com/userfiles/file/20210901063732_o1muwv.pdf
    • http://www.galiantsolutions.com/emailimages/file/lusilutematejirefenow.pdf
    • https://tramhuonghanoi.vn/upload/files/41258851179.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/suxajebapesujezujisinoj.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/61863707625.pdf
    • http://testplanet.nl/uploads/files/pafawumapipab.pdf
    • http://royalleasingny.com/admin/images/file/silakevejinipone.pdf
    • http://oldadmin.k12cart.com/media/files/jitilerizodojadixi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd3.bin
ca2f591f6d5a479206f50e063e82863cd5c6740bf5e5a85134a056f784229653
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 10352 bytes
font_01_sfnt_off0000f522.bin
b31f4368c2a2826171268eeb67b27011b12ac5bc89369d590f09a2dd4d1b892f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 19452 bytes
font_02_sfnt_off0001283c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 16792 bytes