Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1814fbf6ca6ab8a…

MALICIOUS

PDF

90.3 KB Created: 2021-07-20 01:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dee406b538a29a5f5690f96ad5692945 SHA-1: c3f00ea0870954785702e9d1be0bd6d00be0453f SHA-256: c1814fbf6ca6ab8a96b7693674194f6beb2a4be2d4a40c4e94f7d4e98894f500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings suggest the PDF functions as a link farm, likely to redirect users to malicious or phishing content, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eb63697caeed6c37871bd879d657ffe8/puxigovuwaf.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ada1a267---ridexadusomuloso.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/03469d6d4ad23a8f8ea32c154a91731e/47282597927.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2695341489---37151295264.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/jomoke.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/zuruxofulas.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b1aa8577eae61665132d38f759d7b43c/38844517039.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/joxirelewuger.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2d844f86ded1de6fc655c0db386b57d9/gudel.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lebavajowikazezob.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/35287805671.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/wufutube.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8d6832d4---19619588900.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/16463137806.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f224c78b---wuwatipotapixixegapimagur.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/81027243704.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ldv4c15bjfvdsjbb8jv7ds3ngn/nofozepuzaki.pdfIn PDF document text
    • https://aokman-drive.com/d/files/lojazezekewimujenoz.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f45fa8aac75806d2e399186e512355fe/tofoxiradoderafuviwik.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/22042340713.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/73737536376.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/ribimefikaxidisezedojadus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tan+equals+sin+over+cosPDF 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_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 18780 bytes
SHA-256: aed6cf29fce3055874ded48d1994c46c13e5d08b188e3fa811f117ca27cac92d
font_01_sfnt_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B1 10400 bytes
SHA-256: a03c22694b9438300667b3eaf31addb8dfc3ab3d7ce916ec5951b9f98cf7c670

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