Malicious PDF — malware analysis report

Static analysis result for SHA-256 458fe133ad3a9efe…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 01:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c4a3e512a92e2948763ec09c9071834 SHA-1: 02e6c3d629cf223fd7e26b8dd055709f945b5384 SHA-256: 458fe133ad3a9efee86a803297302aa294acbcd4679eed2a622fbfe2f623f2c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=planet+earth+2+jungles+worksheet PDF link annotation
    • http://yilip.net/userData/board/file/dufuxe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3ffc2ce42b94aaedb1864add8a172e57/74309825785.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9a30f338146cfb99cdfd49586afac44a/73175658058.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a41bb22fd---61726431868.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f566bce3fa---jegolag.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/36613652881.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/5cd7f5dfda904bc8cf25eb13e720945e/tawasipes.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/bewugugisefese.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/67086383516.pdfIn PDF document text
    • http://specimport.by/files/files/12745234888.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/gezipumu.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/kosij.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116988e42a8f---23948726679.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae1c5490d---37773061953.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acc843814fb---75209314970.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/wugemuzukujaloz.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/65180131843.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc18c3c61---71821406860.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/duvolulirikimofewonome.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/24735222599.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/fasonemezilu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c628fd1bcdc---sovupafuvon.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ok2qg25mrsl7ie5so8rqm6g9rj/64050466923.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_off0000c883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 18488 bytes
SHA-256: 5d24064bb071ab688e08b44a2dbea7af44a952558a1be7fce50e215c8d8b7103
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 10824 bytes
SHA-256: 7541554e02ceba9e53853d2ae67d54a6ca23e2be0d0f452f2fbb15c5a1e55874
font_02_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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