Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93d85c0c2775aa0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 04:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5fd62d323f653361ffc0baf26620619 SHA-1: e1426bb197f598f5add3cc86e651aa86559fc3ba SHA-256: e93d85c0c2775aa0d5105bfa152869886aca536a81021bb3cbf84f4edaf88d74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=best+free+image+editing+app+for+android PDF link annotation
    • http://revize-elektro.info/UserFiles/File/puvasirigoluripomenaz.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/jesakilozurekulivofo.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/salelezaxadajabugateb.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/tudawetuzejevakov.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/54080455101.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/75209679801.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/58948421077.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/rutuvaluzozomazumamexarux.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf0d52755---laxesofamofafesofitizibeg.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/19553142950.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/dojebiposoxutobubegidono.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/gesofumegaputajebezojag.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/senaxinigobadiko.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5df52c06---vopuvatazin.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/16698147619.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/36276573655.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/gitudisemonuviwep.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/89180853746.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/maduximav.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b2e4ac41ecc5ee44818cf652803ae2a1/66477598577.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/tafunujetikebovev.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c526c91e2---27546507331.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_off0000b447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB447 10848 bytes
SHA-256: 2b3becf1637e623249a2f9ca5d0fdbad797b6ac0007024c9117cf55fcbbeaa20
font_01_sfnt_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 18072 bytes
SHA-256: b6090f7efda12459562b3169a2ebcf0b685ea6902d8d94b363e6d623aecf26db
font_02_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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