Malicious PDF — malware analysis report

Static analysis result for SHA-256 d640e565ea5d0647…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 23:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 70865d338dfc757fd858c0ba4e9551e6 SHA-1: 36506ddba9fd27003a12e89879d7236500453872 SHA-256: d640e565ea5d0647be900018acf418d98dec338c646060984f18da921a575bf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests a phishing or credential harvesting campaign, likely using a lure related to 'free robux account generator'. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://crewmak.ru/uplcv?utm_term=free+robux+account+generator PDF link annotation
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/tibejikakitukexuwatewor.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/5272476525.pdfIn PDF document text
    • http://hflchw.com/upload/file/lotiporumobizexefofugo.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/98176087136.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614eff6c24228---nuwonime.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a1c039bd7---datedotedanuvu.pdfIn PDF document text
    • http://demkapi.com/resimler/files/potamavegutasenos.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/77705497874.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/wofobexunilovad.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/femuzimegokonugu.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/43831847226.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/ludabomuwategufuk.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/wuwej.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/vudabamorigoruvufap.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/24885940481.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161420f1f57e08---20793778396.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/r36gsf4e2t0422elaqgu4mdaat/rakadasasaruxovexuzoma.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/15056484064.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/73106546615.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/mabowazoxudivinadaj.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cc49d79df---suzipunokix.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kexedoki.pdfIn PDF document text
    • http://eichler-kammerer.de/sazilivedorobiruze.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/57642101849.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_off0000b01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01C 15080 bytes
SHA-256: d3b7a263e1830f91709d5c883e0cdc1da89ad60954036a8af1551a62dd5fb0ca
font_01_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 10420 bytes
SHA-256: 17d82358ae2612883e95d3637e2b25b654d2c801b0123d303da510f44003cb48
font_02_sfnt_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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