Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab00ac062265480…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 23:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80571df961a8c3d7573c31935e81151f SHA-1: e497e7c28d74a02351ac2387cc9b4f7eccd6d6b4 SHA-256: fab00ac0622654805eeab30eb68a069805f1a34be38c20fc50271fbd2916b08c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristics indicate a link farm designed for SEO manipulation, likely to redirect users to malicious content. The ML classifier strongly flags this PDF as malicious, supporting the assessment of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/jalevujitawobi.pdf In PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/lexotawe.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/uc06ot7ndfbal79ojf9e7imbes/42399517230.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ed33da0c---31735878026.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7r6uc3bn12upk98295nag4hv23/zejubul.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210815124756.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/26462693149.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/gerivununo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/997n4d6cqn6h307s0uatepn3hf/98877555957.pdfIn PDF document text
    • https://nevisnews.com/userfiles/9224591715.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160792c17ed8e0---44443011210.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/11602651710.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dc57b9310---32073210530.pdfIn PDF document text
    • https://digireg.cz/upload/riwam.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/pulesojerugili.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/88b575b8b2f03e1187d2c41ee8ca2709/3954766086.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/24939920828.pdfIn PDF document text
    • https://miet.hu/kepek/34834490037.pdfIn PDF document text
    • https://buyafranchise.org/files/files/gelerol.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/u4on9tkg0t4oekqqsak1m1ju51/93981395668.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a90c186e7---vixifefotoravuketovuvid.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/27291245189.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B6B85FBA38B.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/453440301.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d4ff23651---pinujibowol.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/kotesabarivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=compass+rose+pool+worksheet+answersPDF 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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 17100 bytes
SHA-256: 68b6e412c1169efb8afa61f395156aac90126463f35973a52c47c047ba9a9d6e
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 10636 bytes
SHA-256: 95fabd7606fc622e5e43e67c3203a9e0e8edff38e2a9b82133cdd059c7841161
font_02_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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