Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a36c9ac1b01ae5f…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 14:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a2846906a9241739becd474fc4ff305 SHA-1: bc219b578ec3a74a68db74d3a426656756e01c16 SHA-256: 8a36c9ac1b01ae5f4987845698ff93012b8bbcb8a789be59a7fa5e44de921707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves as a lure. The document contains a link farm pointing to numerous compromised WordPress sites, which in turn host further PDF files. This suggests a multi-stage attack where the initial PDF acts as a dropper or redirector to malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/a7l6c181lc6vr034kijq731ol3/9081079195.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609630dd68ec0---44520909003.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/55fu7840itpbuvfnu3ida83546/77312407967.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160be4295dcd6d---lowabebolatufabebatamapig.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a382cdbe0cb---22249843753.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a8e636e48b10f22a92b58e137a6897db/lodiwemufikapo.pdf
    • http://jiangsutravel.kr/userfiles/files/20210623_111441.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6fe6975b6---4964362010.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085e35147aca---runesubozesiteramiliga.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b59691c9---50175910313.pdf
    • http://brooklynsmokeshops.com/admin/images/file/66170785121.pdf
    • https://hospvetcentral.pt/site/upload/file/dejadif.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/743d7937304f5786c6592eba06a20e8d/sanizebo.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8d705sr0mmfov9lhcqpujgb0tr/64615254785.pdf
    • http://korean-school.hu/hangul/userfiles/file/sujumakuno.pdf
    • https://ludifrance.fr/userfiles/file/28306385412.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bdeb3f27---28485465214.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/d56c7bc1027305f4f588e141002f972a/18670458911.pdf
    • http://dashoernerboot.de/userfiles/86266841576.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab173fe6d---womugeveketukijopi.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4ec70a603db9898cff3f479cfa26ceea/pomebutivemi.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ecd0a08380f64224138e675c3afcf695/22119557320.pdf
    • https://systematix.pl/userfiles/file/66106740144.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kate+phate+note+exchange+near+me
    • 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_off0000f2d9.bin
caa5d7b107719d0251c69ef6c16f39134d304194632dc9041b7710a816bb820c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10608 bytes
font_01_sfnt_off00010aee.bin
3e09cf9f0500cd585b8aa5e63043b9f339810b38b2c0fcffaa048f5bf786a264
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 18124 bytes
font_02_sfnt_off00013b20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B20 16792 bytes