Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa4c007bfb669a8…

MALICIOUS

PDF

83.4 KB Created: 2021-07-25 16:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de88a37cc91cbf9698141b8d6f412e3c SHA-1: 3cff584c64960e6ba127362b090b37ec1f58f2e9 SHA-256: 8fa4c007bfb669a8121f9e80c34675ddde80112d2c1f83b8a32bdf1e392a9a86
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Analysis revealed the document functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://harmonie-avion.fr/actualite/files/86450567442.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085274037276---32828093139.pdf
    • https://euroroma-bg.org/files/file/3185650831.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/qt93pgad97fgesn8dg3ovjunva/55860486912.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb68b37b74---53156477158.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3246f872d0b55ab3e5a102cddb5a78f4/sarisufunatif.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/d2evai5squ770j5puoa2nq8ni4/67057475687.pdf
    • http://freeski.hu/freeski/file/pajerezun.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/53ebf0cfb2ca54313fc4c564b1aed23c/renilumabe.pdf
    • http://coinproject.com/userfiles/image/file/44409500205.pdf
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/82634267715.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad900952739---fubada.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/66cc4d7af7c8535cb1fa9f460901b567/25485368499.pdf
    • http://firewheels.pe/userfiles/file/funitadotatuxamulodukoku.pdf
    • https://abugfreemind.com/userfiles/file/fekemaza.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/finuraj.pdf
    • http://studiotipaldo.com/userfiles/files/xanaroxolezadite.pdf
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/tajabokiju.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/de66d4ff3d108504a22dff78bb06b0f2/646180166.pdf
    • https://martabaktelor.com/contents//files/sudubufevev.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2mdckgsljbilq15op3gjtjtjrd/72532893067.pdf
    • http://4bx.pl/public/file/puvojiripike.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/dejitadeduje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=integracion+por+sustitucion+trigonometrica+ejercicios+resueltos+pdf
    • 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_off0000dc7a.bin
06bf5f5b1a848a0ff7198b4da128425492461193d5c124fb7eeb19b1ba8904e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 18028 bytes
font_01_sfnt_off00010b1b.bin
f51c3152fa8e0184f18ccb03b35de9bbd9217cb47df915167cd10f487923ec9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 11144 bytes
font_02_sfnt_off000124e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 16792 bytes