Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c03c10a7e3489c1…

MALICIOUS

PDF

92.8 KB Created: 2021-08-30 12:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8b17bfca202908a914667efe2889850 SHA-1: eba3a3ea825afdd97a952837e35bb4b263ebe8e8 SHA-256: 7c03c10a7e3489c1c72fe4d9b19d07581e7e509ad2962a7ce38a2524ad603824
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a93b5152a---30832373462.pdf In PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/bevej.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/dufode.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/quas00p4uq0i20mcmmd4vbon2g/98743243217.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zomebinetuwuragolozo.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/tobelezew.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/41745525509.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1628628936.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/bogowisab.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/sadevogida.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/3164204213.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/12f2cd4637cf385d2d375ab7a847001d/91040749410.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/79883374804.pdfIn PDF document text
    • https://granitnet.hu/editor_up/18902988078.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd746cd70---41330229217.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/wejiseduderovojiba.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/xekuxon.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/pokabufer.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/neresuf.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7faf668bb4796632300f17fb063eb877/3124542043.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a2b9814c0---peziwopiwemu.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/57308427263.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9913c84e72982641855cc86ea0f72035/komusemanuw.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/93737885471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=seeing+stars+hollywoodPDF 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_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 17672 bytes
SHA-256: 1bbf60c375e5eb2d47ae3777667d44917429124f348d53c5b791ba72c1cef21c
font_01_sfnt_off00013377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13377 10800 bytes
SHA-256: e906e6b9183af2e146481dc6a602fcfa2e17ce821cb64b594d552696b35c5b35
font_02_sfnt_off00014c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1