Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9164781ec3b986…

MALICIOUS

PDF

89.8 KB Created: 2021-07-22 08:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 207da13e66daccd324d5ec7ef7e86416 SHA-1: 527fe0520d836d506dd86092cbdff786a921dbdd SHA-256: 4e9164781ec3b986dcbb3793c210c4d5a07681026fa605ce205ce43bba86517e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160758b37a7420---tewanukapegaxi.pdf
    • http://nagymester.com/userfiles/file/44974247567.pdf
    • https://al-farh-iq.com/upload/userfiles/file/12518568668.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3008fa0da40ce32e13528186540d59a3/81839165171.pdf
    • http://5m-tti.com/uploads/image/files/mipodigikigepal.pdf
    • https://quaint-house.com/18794569109.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3849c6d50---tejevavob.pdf
    • https://iwistw.com/upload/files/bumuvevegegi.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/74ckaeb6ama8i50ia96jtpk6en/37930175733.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aa914347f---xideserewano.pdf
    • http://hndgyl.com/v15/Upload/file/2021621717306052.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/21a1798b61e78452716948191383fe28/nabovezegilufojefuj.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/bbeaada194633688aa3b3a6c00764dc6/fafeluximunorixulusaguz.pdf
    • http://utuin.net/files/fckeditor/file/83677811550.pdf
    • http://letdentalab.com/img/files/70404172710.pdf
    • http://dieta-plus.pl/userfiles/file/nisozosuwaxemana.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/n0rbtm0oqcra7v1hopoelgn1ab/vukimakometixu.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/0021e87132ba29727464b9281a0463fb/nigezotunan.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e68beac6f0---revejekumokifefafufejid.pdf
    • http://mwflower.com/upimagesfile///43129960600.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a7f18f9f502d978928506c62dffa5145/xusomenadivobumo.pdf
    • http://al-bandak.com/userfiles/file/21564869480.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/km15dkoiqp8lcp32vpfms9rkh0/dimovotadex.pdf
    • http://uelzecht.lu/userfiles/files/lefozenokomasajamiforo.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b991306d2a---28811598641.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ba91613d30a6651abb0aacd1eb700058/66008229747.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=full+form+of+tlc+in+chromatography
    • 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_off0000fa97.bin
d9e536a255e27f0e4c66897db7393348ddd88b19d0d5b63ed9ed74c129766d82
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 17456 bytes
font_01_sfnt_off0001284d.bin
6e9fa91eb707ce499745b40429c20374a91a559585d3001b139ea300310c6966
pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 10820 bytes
font_02_sfnt_off00014111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14111 16792 bytes