Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb98053c8202cf70…

MALICIOUS

PDF

86.6 KB Created: 2021-07-05 10:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e844f25bfdb3ba9905487cf4f68f6ec SHA-1: e76317c574f7a334c3e2807da3bb0e509d543201 SHA-256: fb98053c8202cf70a7a7cc7cf2bf9b5cb49226abe9fcdaba5edaceb76aaed10a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of numerous links on potentially compromised sites indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ec530d65b442437fa891aebcbf5fdcd9/32218931364.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ae995a275---63372197492.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/47977826959.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t3h84rfimnt8nv5b2jg1jbg83o/vapozatuvupe.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/sulugekezozofo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fg5hjrd1l75n6fdf4gcutpta42/80349623866.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/mekubizubeja.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/731b901b0827225f1c321ab9be65d966/berikogiwezatazigedire.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/63625047196.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/komaxovijaxeboduxeb.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/jf8tsokiddlb1ss1p9id3ot523/57067199950.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d435f3eb85c---japosagoxisuxive.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qtah81ftdv24ic4kf5ed0bt1u3/zidapozupozasopiroje.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/54944392623.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4bea4c983e91ac86f0eb420437d5346c/85876756495.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/98024271822.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/80329518069.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/88051230807.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/br1gnsnv9q1h92pnkf5ir18kp1/rapipafo.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/1723672914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chilled+water+loopPDF 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_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 16596 bytes
SHA-256: 82b8264c603f18e65274b5d2251594fed30be22db6b294d4d741d3035864a969
font_01_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001361d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 10336 bytes
SHA-256: 0c979bdf30263b9914f954946d9d13dcc29e9e98c76920689c61e8ab80bed69f

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