Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4e292e870c84fe…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 14:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a35fb259c40df98c9444ef089122e83 SHA-1: 3ea71521d68a4349d23e314c09a131b68734d090 SHA-256: 0d4e292e870c84fe6036881264a45cfcef94fa3a35bb09b9bcdb95f761970e4c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.allatpatikapecs.hu/images/file/27346345221.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6d018b517a5e97b7fe3c870fce05d9b2/37250510176.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f9721def---xilarukadotizofa.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01877c225e---luwekegu.pdf
    • http://stacjaregeneracja.pl/userfiles/file/16447311535.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072990f4f988---notusenugoji.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d29bf1a334---36780464714.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/46730643383.pdf
    • https://x-software.cz/data/file/42521438374.pdf
    • http://paulsaperstein.com/userfiles/files/xovoxifoj.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0673c2c6fe39429a6955535a73a21e72/97705450226.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/96982900147.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/04ecd8210d8b73b8b1d8476a04d0a86a/wosodexoguzep.pdf
    • https://imotrading.com/images/userfiles/sajoxisidunit.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a2b80b84d---57554123919.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a57e834ae67c018e5627f8c614423c00/risigatugef.pdf
    • http://slesnick.net/userfiles/files/11255424.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cf597792---numufuxukedunaru.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607560e3346f6---55470191653.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/71485037110.pdf
    • https://akapacha.com/userfiles/file/rizajax.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ed37427995c4ae1296535d7145eadf11/bodabovob.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072155e70a0d---jiduzukato.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=reduced+movement+37+weeks
    • 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_off0000eec3.bin
1270d07a0f0d881f2ebd4161ca575691def51cecb7ea6a6e8cf6bd5d011a732b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 10740 bytes
font_01_sfnt_off000107a9.bin
578774e4ce1a2aff56419e0af9ff7147087c2ea7c15e92746bc55a11c709800f
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 18096 bytes
font_02_sfnt_off000135ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135FF 16792 bytes