Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf8d3c84b162463…

MALICIOUS

PDF

88.1 KB Created: 2021-07-19 23:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1e4f3069ab754cd45ab255c5e4c691a SHA-1: 2c9ecd3bb3ee11d1f676658bd74185d2e7e0df7e SHA-256: 9bf8d3c84b1624637912ced7458450a3cd423bd64c034b717073f83e91ffbc82
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/506f6029fc8a50eac07590ae2f1d72e4/gelatudivogirawura.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5580a8b320---mewiginuzunigagilojokini.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/kexatubonaxakev.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/23477970451.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cpeil6r7gathbhig9e70s5f7j3/1374607016.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/90188008742.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/diviwakefuf.pdfIn PDF document text
    • https://armenia4d.com/contents//files/78847031656.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/suxebewu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab934ad9c96---latudojadaxoka.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/772847208.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609200edcb83e---refewabiwobumobemat.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/68ed4c85ccfd7ff377fbff8ab1bc2291/nemipivifilupujatesazepat.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4fefc279538332fa7b8be295a592168f/begorugirelukekelu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e62bd6d7957b71e4d13aaf1e31dae87c/95634304920.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8693288e---94295559484.pdfIn PDF document text
    • http://traviet36.com/upload/files/madukopabesozefejosaxizub.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/29062056950.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/90f68ca5f35d9e8870bc0627308ae333/37820801815.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2e05594f7268b6b12e02990c53743f9c/rovudiz.pdfIn PDF document text
    • http://billsky.ee/files/file/88279994791.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705698c6659---dogitedovawu.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/e04e8ad5c89719dd623234a548dfb916/58999603403.pdfIn PDF document text
    • https://avflash.nl/upload/files/71528850597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=define+heave+offeringPDF link annotation
    • 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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 10248 bytes
SHA-256: b04e462ea0543b1dc5668d4f530b7f9ed7a290be360ab37357fced227aee4428
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 16708 bytes
SHA-256: 52c13f579a72585a2d950bf3e89f9f23889bf652c00371f6b34cf40e57e44b28
font_02_sfnt_off00013b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1