Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f6343f19c0c7d5…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 16:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c9024a0ed7b0f6d3cbb188e4ae2a294 SHA-1: 6378caaec988e464b305cd569f1bcbce7810f18b SHA-256: 34f6343f19c0c7d59889a613be017aafff6dbe159edcd91a69af10c1acf6dd3d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32b4f1ea1---wonilo.pdf
    • https://greenline.bg/userfiles/file/lafudozogula.pdf
    • https://aczv.fr/userfiles/file/vunoruwofezobevezebezebi.pdf
    • http://zawodydrwali.pl/app/webroot/userfiles/file/55268073548.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/13c2550a2776ff1e000f3b017d7af048/lodofimaki.pdf
    • http://yuha.be/_files/file/30081748073.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/kuviso.pdf
    • https://newshieldinsurance.com/demo/gsa/final/images/file/lozigaboxasox.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8c905bf00df6b7124bafb96b904a4e64/13536478444.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4cbc4645---xufulaxu.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/vizanafamimozipupusivefa.pdf
    • http://riggi.ru/userfiles/file/zulawewigulebififebekox.pdf
    • http://mislenyiallatorvos.hu/userfiles/file/xelolukim.pdf
    • http://msmzizkov.cz/data/dokumenty/88607688534.pdf
    • http://vngo-cc.vn/cooker/public/files/23155815071.pdf
    • http://patp1ryb.ru/media/file/75878282907.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/89947491235.pdf
    • http://artgraf24.pl/userfiles/file/rupekemideginegalesuvak.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/16871934046.pdf
    • http://smepil.com/ckeditor/userfiles/files/bexotumuvoza.pdf
    • https://dennismaloney.ca/upload/editor/file/kupukowoguforekugezoda.pdf
    • http://pro-group.ru/userfiles/files/24926897904.pdf
    • https://advik.net/userfiles/file/11549302025.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+suicide+squad+torrent+magnet
    • 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_off0000bc5a.bin
09abf6862fbe8bbbbf7bc731d5ed23aee5dab9c0abce06e6a06b328ccbd0c69f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5A 10980 bytes
font_01_sfnt_off0000d528.bin
670ad764d8bec0931091c5ae6ce21f7d27a65b9e203cb6d209e4c476ebffa476
pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 17064 bytes
font_02_sfnt_off0001016e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 16792 bytes