Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ce8ca6dafebd86…

MALICIOUS

PDF

89.9 KB Created: 2021-08-21 02:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41ede07e435d014fc047c95ed587bc30 SHA-1: 91066eba8332ae47f96dfaa109b242e4f7fde5ed SHA-256: a0ce8ca6dafebd866cc155f5a94974dcea7774b4d7e653a739620217eab2f16e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d8eb081339258604bb093fb23862f241/matidepokiw.pdf
    • http://anandamsanyal.com/userfiles/file/9195999881.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b452bee27---82647706533.pdf
    • http://westernmaki.com/uploads/files/dimutaridalelazavav.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/mudetotegujak.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1a9535bd31acd591c52c289940e5a885/lunadokidizutibog.pdf
    • https://cornerstonelaw.eu/userfiles//file/sojujakevafibodopupekiwod.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160984b0cf2e20---83410861620.pdf
    • http://ladyvenus.it/userfiles/files/dewifoduvep.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2cu55pk0n6hd2rfdkjkgl90bji/13690984030.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f5838e475e6459c2cdba86c48d98e929/88337488166.pdf
    • http://bmcnx.com/userfiles/file/bafebidowefese.pdf
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/dijozipobupu.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3e758522---30400840478.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/joxojidu.pdf
    • http://crediramasrl.it/public/file/jifogedefoxuwapizupenamit.pdf
    • http://duancanhotot.com/upload/files/41397776131.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/aljfh1adjrdi9bqed6kakjk0e5/16586447536.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8cf9ab829bc4073d8622592eac3b1c40/57438053263.pdf
    • http://incomingmakedonia.com/files/files/7767900461.pdf
    • https://alarrabnews.com/images/content/content/file/92197965919.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608de58a552ac---79106631634.pdf
    • https://incoyun.com/calisma2/files/uploads/15075225345.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=percy+jackson+%26+the+olympians+the+lightning+thief+movie+wiki
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56c.bin
74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 16116 bytes
font_01_sfnt_off0000fac5.bin
5b6c1807c34d59091bab8fa2201de759177ae9415fad5528193f004d82e1ce97
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 10324 bytes
font_02_sfnt_off0001123a.bin
c88271bff562416128ab2281ad2280d67307c1706aca636297b358d35e496a0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 17892 bytes
font_03_sfnt_off000140d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D6 16792 bytes