Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7f2f7c37e8c7af…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 08:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af8b686306c193eeffacc62fdf3525e8 SHA-1: 28ee6fa5f7108fba87c7e2dff24c13f9c6c380f1 SHA-256: fe7f2f7c37e8c7af5eaebfdc89b43acac7b6641b00548a409dd1d2fb0f9c4823
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://uleshuzataruhaz.hu/files/file/danokotafiseluzifizirur.pdf In PDF document text
    • http://ck-kutnahora.cz/gais/image/file/fobedexelonovosogerad.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f338e0836e125c7eed0758300e6d5075/nifisaxulonidodufutil.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9c1a488---kezumubufakenapazo.pdfIn PDF document text
    • https://shopabrang.com/images/files/lasipasidufabamapivapomo.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/15856746511.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/79983521627.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/19792494990.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/mexup.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082428763431---wunufidafagu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4590flargdkdari2qsjn3n3r9u/nagojuginu.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/98271340374.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/rukuro.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/losebotefim.pdfIn PDF document text
    • http://noelex22.org/userfiles/file/17889636692.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/vikebesekowizusokor.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/polubajurufume.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f21633cc4---lojozug.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/xoxuwekubarunagukati.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/4257319874.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/femijujir.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6ba71156d7703c73d136320cbedc0d32/24446432028.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/89a08c90dc9d76e9798268613591fc2b/josamulurenariw.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608592e6a0353---wasol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=excel+to+pdf+converter+pro+apkPDF link annotation
    • 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_off0000c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 16588 bytes
SHA-256: 96063e9bf970cadc56fe162c47259603d2a847465dfff6e7ac0d328bff9f8edf
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10596 bytes
SHA-256: 83da4eb920a544438a46ae28344c860f6e03fb291d3a63a389b37998fdcf485d
font_02_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1