Malicious PDF — malware analysis report

Static analysis result for SHA-256 746187a6f6cd72a2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 17:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d827665d534527ec8b03a6acc5af0498 SHA-1: c4c8c43e6b3bb94e7c93356df816a826d089019e SHA-256: 746187a6f6cd72a2844d134159870f9ff8390672bcf5ca10188fdceebad57436
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads and disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://alutat.com/data/file/jevunerigoza.pdf In PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f8a3e48b6---55685625878.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/zokuta.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/df47bc4da139126fb27c4e6b1705acec/zusuwizedixixuzuzofikape.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6a74b6e9e3d4e17a126383c0c6dccc82/pekobedenutux.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/38779556958.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/86624464997.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/ziwukolexexomexafuvudu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f33c8690f63278710bab0e5c9b69b252/13239246976.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae936f2d101---likubajekeluzipo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd9d742516---kumodujimapo.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wimudikikejunalupogud.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/884a73b84806e28731d61a056cfffd58/4149226197.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/bavonofojibaxuxokowijik.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff9117353---39290223938.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2915eb94f1c479e2b21127a5add898c5/tulipasom.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081235b28459---17349414620.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928ec4e673d---80408042059.pdfIn PDF document text
    • http://vswet.ru/f/gulafijewotojadalup.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01fc85b76c---jazibu.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/45193388658.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/85240897446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=instrument+engineers%27+handbook+fourth+edition+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA5 17948 bytes
SHA-256: b9033c868c726c26488078a49f5fce5e97b3e75d696ca66a64125d5d36ceb922
font_01_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 11216 bytes
SHA-256: 48b407c9ae0eca17bd432bffd62814204af73ecac2af26eb36f44ee563123a56

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