Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cec2768452c4e38…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 04:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d5578170063f93f6f3b25a81acf2f14 SHA-1: beeaa40294ee4ceb9a97759a4792de1daf4cf651 SHA-256: 8cec2768452c4e3858e3afa4c14b188675f48b900e0e5f38e7c1e520fdcc9235
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable domains, designed to trick users into downloading a malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/97901429815.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d89216ebd13---gafanuz.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607577ff08170---pefekiwuw.pdf
    • http://accessiblevehicleservices.com/userfiles/file/71052142856.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f763e6c2f---30702685398.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d2b4e7496d73e93dabf6272d78e234af/revij.pdf
    • http://cn-junsheng.com/upload/file///20216663521922.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/688aa24664166449532c3ce4b8db05c7/40593148897.pdf
    • http://forglass.sk/userfiles/file/54326545858.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b81050baec1---xagupigikibo.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b03f1e9b8bf---17299082204.pdf
    • https://cleaner.pl/userfiles/file/89730903465.pdf
    • http://vetranhtuong.info/luutru/files/jisonosa.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f1384b06---33668064605.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/82e97c852f1e2b18624a285aa448e413/guwijiwejubugugare.pdf
    • http://guojingmall.com/userfiles/file///81991863569.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d70f8c1fb---fulazemodezo.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fe8ec7e509d1fff635061da790e611ec/jusawanirutelejejekaluz.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830891c4b83---zobidudoreziwasewoluzu.pdf
    • http://mdc.ir/ckfinder/userfiles/files/20856990203.pdf
    • http://aarogyamedico.com/userfiles/file/11428319807.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e198cd1e3b---77133557761.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/07ce7eb2f3fdd0a387b3bed84e310062/xofaxurevafef.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c601577c8afb1fa330179c43b0eca5cc/60242444275.pdf
    • http://girisimcilikproje.com/resimler/files/77217117166.pdf
    • http://nuocmambason.com/upload/fckimagesfile/bdb8b29fddab4c798c498b36748cf154.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mcq+of+control+system
    • 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_off0000ee9f.bin
4d0bcbbcfe409c78a14d78fe375ff1b1196d407d3deb3823163f0841081f9d0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 16256 bytes
font_01_sfnt_off000118ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 16792 bytes
font_02_sfnt_off000130c3.bin
c5123f448df310fee83a87710632eed58e2b2afd2395647fec99755ae1bc2e82
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C3 10496 bytes