Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3d3bd718422310…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 02:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 227bf0750b4bd86ebabe39e5aa2fb9c9 SHA-1: 6b9c2e874922efe3fdcfde25cdd78509ec59cbf8 SHA-256: 4f3d3bd7184223100e17b3a98410e1ac2d9508904f38c037b24b91fb0367ced4
172 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external links, many of which point to other PDF files hosted on compromised websites or disposable domains, suggesting a link farm or redirection scheme. The presence of a download button lure further supports the intent to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://stellamaris.cz/userfiles/4097461669.pdf In PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/46060020956.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/61303542810.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/noliruniwasil.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/35797417240.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/pamerurugesovum.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/dureligawixib.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/45873829335.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb660a107---zigalej.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/mipimu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed40b31ca---99228092640.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6430442ce9987d41390d4aefcb1a3b0c/wuxivoxivigijo.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/80440936040.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/dezimo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/10f69759e996d6c89c94019344ef7bbc/74731380331.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/69106356644.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/ralonek.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/455460248b06c842b83f868986e27e42/23118904651.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/69528691567.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/12991680155.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163192319644489964296.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/nulukaribaxaxamuzusiw.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/jukalulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ppsspp+highly+compressed+games+under+100mbPDF 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_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 11392 bytes
SHA-256: fdca14f48dea816c946d86e26676b7e54bf8599a4a511149859feba67c1e991a
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 17816 bytes
SHA-256: de198bfd67eb17980a4ae7da581d74e1e7e32fe881def671d2869a7785744fa2

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