Malicious PDF — malware analysis report

Static analysis result for SHA-256 accf2af124ea51c1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 10:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c18301659f13036433099c5565709c7 SHA-1: 1dedf1ad3a68dbb214b051343c989f1e62494e79 SHA-256: accf2af124ea51c124d43df01c6bfd25c4ed67e391fec942462b23a82534f8a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=adobe+illustrator+for+android+mobile PDF link annotation
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/pelasifomogi.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/mokatozifexavawajexagul.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/suketubilanoxigo.pdfIn PDF document text
    • http://totoumi.jp/upload/file/22705960385.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fe677d70de311939d0e982039fe17fc8/lavubog.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/58976263326.pdfIn PDF document text
    • https://oasis-travel.ro/files/buwikojoxafaxifereli.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/mupuxewexap.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9076e2ec5dd7db164d7e4db97d99355a/78326469961.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/xarif.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1be55551---78724063520.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d287b06968---pazoxamutet.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/radorusager.pdfIn PDF document text
    • http://hjhchem.com/upload/files/pezofemat.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/bepupadexunav.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/35663768384.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/mozizeboxasagusew.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b136e3c4---4776287874.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/roredabipunurusivojorune.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/73435033978.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/943807013612fc5c4a46b4.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/75423904624.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///26074306326.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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 17540 bytes
SHA-256: 83fef9f47fec123576f8b3e8517c94b82185bec953056b1b6d394de211fbd423
font_01_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 10736 bytes
SHA-256: d2084dee84299d10de73a3e713fca8e8ee72165306b1d608660b75ee376c4f95
font_02_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1