Malicious PDF — malware analysis report

Static analysis result for SHA-256 d328faeff8ae1c4e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 10:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d859a2187d43e51caa0673c4e879c2a SHA-1: 1270d269f005506d69c15bead74501f166326472 SHA-256: d328faeff8ae1c4edf299dbca06a751289d8355c8af4f06c1725802d9cbd6dc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://archism.ru/uplcv?utm_term=william+m+anderson+elementary PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a736644b63d---woxaje.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/50418ba2579ff79ec5f5f5bd86cab01d/53585296618.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/fusekadejegewu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160895082e845e---96753721234.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nijig.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/koreravipo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da429c1b6e1---kebawefupinojavegeporawo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/6ds3d3r5k232p9cc6o1vqh1048/favajaxexopi.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72fdd8105---jojadilepirej.pdfIn PDF document text
    • http://jonellchem.com/upload/files/welividesomufarunaperit.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///kewepafafidap.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/99153304936.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8a33cd6f3ef80871ee0b2af5a45f8f6c/zupet.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5gi0eq6omn30679g6d5chj5ea2/jelifobuvebagamowerir.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/52680185612.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/ranasiwe.pdfIn PDF document text
    • http://ping-property.com/user_img/files/lugurosofi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4660a549fcbf28dd45bef04291e0427b/91819150484.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/xawitipu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e2accd5e15df15b97271a4f43a710d88/mokige.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160704635146bf---jekej.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2ksavoein9muhg2p0icv57v1u7/bavizubu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/jowikokon.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/38542409831.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0F 16120 bytes
SHA-256: 8253c69aa7e3b1edde284f79f7ccd847eab2335c4736db7ade200a090c2c5a14
font_01_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 10516 bytes
SHA-256: a8c06e1c31cd7b78b496b535457f804a32b7afae77ac5dce2833909745112246

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