Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b522b361732ff8…

MALICIOUS

PDF

89.8 KB Created: 2021-08-13 15:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b63d1e5717fdbd2a252c045d8f92a9d0 SHA-1: 69921341df6a1e81c0f838237c71df59d1b80085 SHA-256: a1b522b361732ff8d3870a152e1b1e26fbbce780e610c1601972a2f6794dcf69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs that form a link farm, directing users to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=%D0%BF%D0%B5%D1%81%D0%BD%D0%B8+%D0%B8%D0%B7+%D1%84%D0%B8%D0%BB%D1%8C%D0%BC%D0%B0+50+%D0%BE%D1%82%D1%82%D0%B5%D0%BD%D0%BA%D0%BE%D0%B2+%D1%81%D0%B5%D1%80%D0%BE%D0%B3%D0%BE+%D1%81%D0%BB%D1%83%D1%88%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE PDF link annotation
    • http://glamour-nsk.ru/ckfinder/userfiles/files/20661218255.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/vumuvinefupu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7bfee1a2---42625826549.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/zolesabekerejudax.pdfIn PDF document text
    • https://menu2uplus.com/images/file/93855233328.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/185b7f058690ccba361e648fb17fce1c/bululikesuxesizinid.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7689b5b88fb04290a241468848cdbd8f/20102475429.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hkusstdbm4nc6rg9eh8u36vl16/99260833610.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/panakojaziset.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/56237918659.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16112f0c3929b6---45534812994.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607209cf5106c---kobaxixaporojarutasi.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/cs1i6p2lmvgcihehgempdtoaqb/kubexigoligidizuju.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c09aa057eca1443d82b128c222578d08/lalunekipokelorim.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/29592758691.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/pomepijiwepa.pdfIn PDF document text
    • http://tencanpowder.com/d/files/39099732871.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/kepijukinidifas.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/43261851200.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/17852202206.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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 11656 bytes
SHA-256: 74cfb6741e40a04ffa9b639c32375848a98246883dd9fecd7270246594a68a42
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 23576 bytes
SHA-256: 4ca3226043294aea9a7937b5d08c0f2d584e44b36612f9f22266d42a323d884f
font_02_sfnt_off00013d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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