Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fc256cc2c71d13…

MALICIOUS

PDF

91.3 KB Created: 2021-07-22 16:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c909c8fa715968dfad43785cc3073eb SHA-1: b784ea33cd7c64c7ebbc3138d2a22a90cba42262 SHA-256: 12fc256cc2c71d130c110c6ee4d981e6a1beba49c342832c21410f797364df02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, a common tactic for phishing or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://busankid.com/webfiles/board/file///15849086761.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/73671973665.pdf
    • http://cycling-software.com/files/file/wawozuvujege.pdf
    • http://bijverhoeven.nl/uploads/files/54601791354.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b477f652bb6---37667149709.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a542794c98---4941675919.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/78835521412.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/pajomokise.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7d12934c5b0a559db5aa84ca55a86427/80247983258.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/bivobovudizaferemabijoj.pdf
    • https://carlojans.com/cms/file/69174876991.pdf
    • https://rm-parketi.si/uploads/75392498002.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9336135339---95432290818.pdf
    • https://sportsht.com/userfiles/file/mugowisezoxagokopogunedu.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/76471120838.pdf
    • http://animationcoach.com/userfiles/file/puxukavozeb.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/42454146174.pdf
    • https://istihdamhaberleri.com/upload/ckfinder/files/guraw.pdf
    • http://gyobel.itpublic/file/87231306542.pdf
    • http://aaaexpressac.com/userfiles/file/52438057532.pdf
    • https://brianhigbielaw.com/UserFiles/file/nalinadi.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b62327ba7da---tudadu.pdf
    • http://com123.vn/uploads/file/50097553372.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/84861dab13e538b38d9e27ba8af7e488/pulunolatejosid.pdf
    • http://chpcentre.com/files/file/tavajujexifofovekoga.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=quest+tv+live+stream+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010342.bin
db0c674299be230c32d40220d5f7760962c76a2a3fe73d2057d1b3d3d94581c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 17016 bytes
font_01_sfnt_off00012f64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 16792 bytes
font_02_sfnt_off0001477b.bin
890f3215c47a1e369e516b5339eef7ae5850177faaf61620ba783cfd36a58a46
pdf-font-stream PDF embedded font (sfnt) at offset 0x1477B 10376 bytes