Malicious PDF — malware analysis report

Static analysis result for SHA-256 5858331201d406ff…

MALICIOUS

PDF

87.7 KB Created: 2021-09-13 02:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c5d9ea865bbaea4fea1f2786204b8e6 SHA-1: 0d62496f21c5fcf94ed1c5200a82787ecfe2ea84 SHA-256: 5858331201d406ff2163ebe32ce07e7b81df8208c32bf2dd71347277be4aad0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on different hosts, often with UTM parameters, which is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=thoptv+pc+windows+10 PDF link annotation
    • https://bestcaps99.com/ckfinder/userfiles/files/jexuzirozakeg.pdfIn PDF document text
    • http://fourfoods.com/images/files/wijukexekos.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613180fbd92a3---dewowes.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613419de9e2e2---pujuselovotudawexubokoj.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/qbs0937rnt8vg5l307ab4mmpb8/kenikomofepumipelun.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/65737153617.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/44996056593.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/36330367512.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/74573867340.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/3658741656.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/75143757732.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/toxaviroxowufujid.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12ffaa8f4---wikizekegesuponajilogi.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/52143512792.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/gilewa.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/42285418656.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/jidaputam.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a522d7d6---32749780716.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/zasedonaniruve.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/96662924050.pdfIn PDF document text
    • http://masonhn.com/d/files/ginapuxesozabij.pdfIn PDF document text
    • http://safarang.com/basefile/files/karokuxuvawodivapobakuki.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/tewigevijeke.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/denatupakul.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/zubemivuxefunizeki.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/zosawaguwazo.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_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10460 bytes
SHA-256: 41db302f0fc6aae5aa0f7431a2b0102e8dfd8684abb452457b8832afc20bdb62
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 18136 bytes
SHA-256: 06325d22c336b0c982e016cda9791d332883f27251a6c46134247288398c5bb1
font_02_sfnt_off000138f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1