Malicious PDF — malware analysis report

Static analysis result for SHA-256 da205c591e07123f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 17:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66bccd84213c6d38dbe686a8541468c9 SHA-1: f686b7a2e57b9100eb5cff743d9983a1085da419 SHA-256: da205c591e07123fbe13815cbb76ec8855c55a2c6201038539b238ba8957fbd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use URL parameters indicative of link farms. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=type+410+stainless+steel PDF link annotation
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaab6333f2---36025230730.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/uctpqhb1ums4tvsm71l3u8017l/20969699541.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/rafigubolupini.pdfIn PDF document text
    • https://plasy.com/uploads/file/rajazufuxosun.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f32ebf646---32208261037.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/tuposu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44c611c03f---99308393613.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/aac553096e59bc7eb35db22af850d765/28543323519.pdfIn PDF document text
    • http://a-pluset.com/userfiles/42507337166.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7dda16ac5---vifewitumutuxireve.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/99238d5efb654ec5fe341df46e63ae5f/74873539296.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f43474ce93e---14393974397.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4652bf60de14c1b4f09b2baaa8077992/57627480000.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ccfc1dcf71---93913954656.pdfIn PDF document text
    • http://waypl.pl/upload/File/jelaxifezijebusizok.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/6697029927.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/86005145232.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/fagozapeso.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d44b1362a21---nusev.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfa767d59---tekuzasunuvusefakalomazud.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/eqp5pk7teog68kps2cfvbgb5b1/26624071247.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_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 17616 bytes
SHA-256: 6611c488a1edb3aca36f1707ac1da269ed0550ef60cc86f955d0e1a16d4bb98d
font_01_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 10352 bytes
SHA-256: 0a18f0cdee98120a4c7006e4ee7db949968bf99a854600e8870a2334f2ecca49

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