Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c4366ba9e9238b…

MALICIOUS

PDF

99.5 KB Created: 2021-06-30 10:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0796e6f483b6b290445acf391d0a8b76 SHA-1: 9e245d10ff802c4c4afa0d2090a1552932366969 SHA-256: c5c4366ba9e9238bf7fd4c970121e25c90a04fbbd90d221ee6b7e901f8557143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple distinct hosts and the use of disposable hosting reinforce the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://beliangka.com/contents//files/mijifafifalegedofadew.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2e9e0dfa821e195b942bdf06ac67bc73/65693151458.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e487bcbce---71563340114.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/57d28082212f62d2fbafd2afdea4fd7d/48935614887.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca66484fbb---devapinotikiz.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa31303b7a---68885379003.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906843755f8---50080071491.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820a2f2c7fa---jowebu.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/srvpuniq8i6addm71gi63h6aeg/656125220.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/3409ba5554a599bda1aa57030136af87/25831261492.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/92fd07f8bcccf60e21aad0b5da77fb17/duvigowiv.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d28d896e8---38074218079.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c175a10482---32100045961.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607765af49c8e---53098111042.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3047c7dbad04d8280ed1135d134bf0b4/naledazusolize.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072549edc335---51911324610.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/47517c655fb5f8bdcf3258f06cc74a70/datepin.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0c2c92f30---84994768802.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096040342a51---91240969009.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5d10c7eb---83468458167.pdf
    • http://thepnguyentran.vn/media/ftp/file/16618473021.pdf
    • https://go2germany.ru/files/file/2017644610.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/55cd90e7c441eee4e793b17e09ab7261/wezozix.pdf
    • http://studiomarazzi.eu/userfiles/files/lofemapizizituxavimalive.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9ae3a077---68692926643.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chinese+to+myanmar+speaking
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001120c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 16792 bytes
font_01_sfnt_off00012a19.bin
2df003bbc06b7fafbda62552f2488bfd7d3b2e97f028aed31da476523cc5792a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 2292 bytes
font_02_sfnt_off00013437.bin
b8446d2606633f71594deacfa302ca411ed770041a833e8382b5d0c7af70c57b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13437 10888 bytes
font_03_sfnt_off00014d4e.bin
c255a89ea4ba8c79207f228b3568170f0d69be1a426b44b0d6546d757a736278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4E 18900 bytes

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