Malicious PDF — malware analysis report

Static analysis result for SHA-256 0564c2bdf96a6ffe…

MALICIOUS

PDF

87.6 KB Created: 2021-07-07 05:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5237e803afe929555b8d6face8764e60 SHA-1: 2159bedf24f662c0234ff0350e164efd9c34c804 SHA-256: 0564c2bdf96a6ffed8258a3725188b99d19134228bc2b9ce983530f23cf4175f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://cructi.ru/uplcv?utm_term=growing+tradescantia+from+cuttings PDF link annotation
    • http://tks-forever.com/upload/2021/06/19/file/nifomigopinikibunoda.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ff02474a2c8c534bdc61112d9a4a692c/37696039783.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608b79ba998c2---8914900105.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/31280497845.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58b1b294c---javok.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/gojusasuzil.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2a077f35a8d7454ffb6d1df213ab9c80/26221916333.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbeb4c754c---16904845452.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974ebe369e5---wemefupuni.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f673bc6ec7---xoresimefikokuvupuwu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d83f7928d---62345673994.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/67315632390.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/70581307923.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/4397d61a31c5a35bfd115c0db44cf90a/47999525597.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7d856fd696b0987259d0d64774614365/41967750739.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/5424233415.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/89574353205.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/67879483692.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/28730738281.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c924138b---73589998187.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b1399d671---69492844952.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/suremosupugevu.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/98587749616.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/5954204464.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_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 11000 bytes
SHA-256: 85aff18316ae29477086e02cf46da272d07a39cac308207323ed1da8c7d36aa5
font_01_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 16924 bytes
SHA-256: 92ef3fe859efaac60908b67e73baf1f3656608ac0145b52f9591e4af350c1cf1
font_02_sfnt_off000138fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1