Malicious PDF — malware analysis report

Static analysis result for SHA-256 be631f13f9fb4ee3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 12:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ac551ba1eb172765d27b2d01b2cd74a SHA-1: 5151b5cc5cfdf7e31892bdc272a8ede8a2dbab21 SHA-256: be631f13f9fb4ee3c9a8b8d37c7b202e259764ef821418ba5262fcdb9aed3e22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://queure.ru/uplcv?utm_term=student+of+the+year+full+movie+download+with+english+subtitles PDF link annotation
    • https://cafesca.mx/ckfinder/userfiles/files/gulavikutut.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/tenemuxujorobelegikitis.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/55285766926.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/73906088701.pdfIn PDF document text
    • http://wuchem.com/upload/files/fegoboxanegepop.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/30156165911.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/58918973926.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/0c652e1172066e8d6b07525aa0e645b4/dokikafuxidagapudoliluta.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/bomidaritad.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xudajejamoxifinixijuna.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vasalibep.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210905_FBB54FA9F87DC572.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/jageposaboboxosus.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/57298004077.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/jizovalubugu.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/luwuno.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b566568b8e---xezufijejopizebuxavon.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/10680312744.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gawosutuk.pdfIn PDF document text
    • http://kleiberit.ru/files/file/34519805513.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/70052851439.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/64914655795.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e4b1bcbbe2cbbeaf10b4bc621c299a3f/10378438838.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/tafomakosuwuxunebi.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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 18816 bytes
SHA-256: 4b33f411ccb8c75b398f6b1cae5a66889ef5308f8385fa9cfe549f65e67a8118
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 11384 bytes
SHA-256: 2d8e8667cc1eb2bb6723db143b2e358cc18bfd208ba2ec368794495e24fd9115

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