Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc88d2e7c63d0234…

MALICIOUS

PDF

74.9 KB Created: 2021-07-09 12:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05468d2039094b6b94ca4b740c9d6c03 SHA-1: 2d3dec62622555748225ae6a548febdaf47441f0 SHA-256: cc88d2e7c63d02346b157c2a24049908899f9f3087d01079f95ad70403545dd7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://saam.vn/images/content/file/vopew.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099567befcc0---83253162605.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/revilanogedejibisoris.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb568d0743---bavuwuwibikinegur.pdf
    • http://chokmanee.com/userfiles/file/94674985580.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6vimjfaf6g1jgq2vi8unjeji82/8401854052.pdf
    • http://htwy.com/upload/file/dowebodi.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a30235f2978---74641255910.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0734e80e665ab27db692ce35f6b5af1a/xedijig.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/51366929224.pdf
    • https://acgroupenterprise.com/userfiles/file/lagolukepususazewuxami.pdf
    • http://stlnsk.ru/uploads/file/94346814802.pdf
    • https://negaratoto.com/contents//files/wugufurarijaxubugoto.pdf
    • http://nadiadsa.org/userfiles/file/3280073373.pdf
    • http://brmhn.com/userfiles/file/20210521020847_nsxwhx.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6898035bd9d93a5697d669644bea75db/zofejuzoxali.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/jimanazapokajixe.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ko354kvc5seuu862ef5vmit6ai/37215762971.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ed3839cc---47307512791.pdf
    • https://avigailpekelman.com/sites/default/files/file/35795833449.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/p6d08gf01hsdufmbo75241vqnr/tenopajoso.pdf
    • http://adamlegal.com/userfiles/file/bubebomiviwonosumu.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d988e59902---51550038897.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9ae2c05d---76107853786.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/685fbf65808d07a590db03877263d077/28599025351.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sin+x+and+cos+x
    • 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_off0000c544.bin
e90869f4d923a03d4fc585601592495f221c55c6fd331d6b6eca6d8776d6cee3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 16368 bytes
font_01_sfnt_off0000efa5.bin
8be6aa816295be503f046df211d59959119fa7514d304e999d62b733d006a625
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 10164 bytes
font_02_sfnt_off00010673.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 16792 bytes