Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb83fd6ba027270…

MALICIOUS

PDF

377.0 KB Created: 2021-06-27 09:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 48e1c8cf1fcf056d76cad3b583288acd SHA-1: a0c8280044e5f39cebb6572e85380401cc7712e7 SHA-256: bfb83fd6ba0272703b217000ca7afeff467b96226dc872b3929ae76c8c065991
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The high-severity heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically flags the use of an SEO redirector for a "free-download phishing" lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=how+to+answer+to+what+extent PDF link annotation
    • http://cambridgekapurthala.com/damana/userfiles/file/botozonanimawe.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a094bad1f1c---rikamesifegebenoniwifo.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/nijizirevaf.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/1j9gk56afnduj8q4nns0a7cvqt/keximikasejolanevure.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/71920712440.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/wazivuxa.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd942c9547---xewukeri.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4d630ea6---7714016973.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/891766f041847120aff63423d6079b76/81349927850.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/af74fc9cd393a3717b3448183fe96e74/52321393233.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a90a060c---89888076906.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6735b870e---37125209428.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfdf9ebb6f---53758835414.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bc26a6cf4---kakepepolij.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/44464830938.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2bec04f556a9c60fb8a4b77d8eea721d/girirarazitowazexola.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/97809107561.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160719f62b4297---33067056587.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/9cfe45c412306dfe68d86137b14b6972/ralukagorisovutifazona.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/29114456463.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/zemolopoxusefegibidufed.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/8059871855.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fac9952cb226efc7b93f838b62be4968/kosoxez.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/gqeklta6q2hl9goooep7jo3a67/3275454555.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_off00057101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57101 19852 bytes
SHA-256: 8033e1bc5359f24c9e172a5f705aebbb4b7200a181a1a366d77892bb51cc1480
font_01_sfnt_off0005a5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0005bdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDD4 10244 bytes
SHA-256: 720035a2fb69536d87b9d728620b3e812fc75c80af1ae167d7aae315458ba60c