Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56958c892092110…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 07:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: db9749cc4e211b79b232ffdc4d83289f SHA-1: 37b42e1fdee87dcabaa5597a0fb743f1402fbe5b SHA-256: d56958c89209211038500205fc75ab11c0e9580f323c1784d4dd52ec52238eb1
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites with form upload plugins, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of 'invoice or payment language' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f529d7e59c34dee0d99b49b769242a90/nufavubefoka.pdf In PDF document text
    • http://sva-jeanroze.com/xmedia/file/nabovanamalubumugogijese.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c011223a6c4---32392655156.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081821fa8855---lenaxokonakawufor.pdfIn PDF document text
    • https://pindimana.in/uploads/file/duxuzorifofajuboraguka.pdfIn PDF document text
    • https://aitalk.vn/upload/files/bigojazofaboten.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf04bc3cf9---3704717557.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vegidiw.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/32938660563.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a487131d0---kebomawozepepesuzufoma.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/77726763559.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bd2edfcd---kebunexomudirepabum.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/moloriramenu.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/71843692542.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/5935d64f83603dda8fd602cb443c262e/68440414432.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/sevunawesum.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/59255110771.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89d691254---duzenefirudunorilo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cfa26af0b---43806037773.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/xemizi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/36943503645.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077127e69def---ladofegexowosuz.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/l8kqe4l5tan4q50a6vpthg13bc/76318350109.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ff0ed602---tolenusukag.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/2ca74bfef1097bacd05a73400780209f/nasigojovib.pdfIn PDF document text
    • https://airbays.com/userfiles/file/vozutifemoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=difference+between+activity+based+costing+and+conventional+costingPDF 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_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 16072 bytes
SHA-256: f2565755418ffb14ca59021fa337316a8688cfc38074042bb356e56ea1e0d266
font_01_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 11060 bytes
SHA-256: 58884c1a8c05bfeffc9c7c07c6adbb04d33aec91ac5d705292219ea070fdae25
font_02_sfnt_off00013498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1