Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f254543defa6129…

MALICIOUS

PDF

88.6 KB Created: 2021-08-15 09:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41ea791b79c09dc7b6ee0fcefbdfafde SHA-1: da0d7516778507a8682ddbe8509064e524b9a3c9 SHA-256: 2f254543defa6129ee575a6851bc89f9a17c66d85fa445cc27443b3f8d75d407
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and an ML classifier flagged this PDF as malicious, supporting its role in a phishing or malware distribution campaign. The file's structure and numerous external links suggest it is intended to exploit users through indirect means rather than direct document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f4412d09dd6eac1d8d1fe5fecf4cd57b/39302994858.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/55404851392.pdfIn PDF document text
    • https://amblamy.ee/upload/file/78795190927.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/40766189598.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/tesodolope.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hhjudpttn4cgdbtlrbvab3h1v4/punexudorurimova.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/52258631250.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/sekajosexotad.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6b3b602b03c4a0d4e027bba46ab87658/putigasof.pdfIn PDF document text
    • http://hjhchem.com/upload/files/56914370550.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/44d8b1d853eacf52fef668ab610f564d/15622518361.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/68361499832.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/8660396650.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/40426496186.pdfIn PDF document text
    • http://praguetransfer.com/files/file/gesavuzodinarufasef.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/lelasetividok.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/42899070882.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/sau4eg3ojcfh3pu44fg7ftor49/xumisizaxupakifajiwewova.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078b93baddf3---sisagonevis.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/itegh4ag0s0fva9qqk1achmeig/39352205263.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/26361659806.pdfIn PDF document text
    • http://sparkpro.lv/content/file/boludusuvezujaramar.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tapafigudipesuno.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/3082309330.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7ad847be---napufuvemudarog.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/063aabfb923d34b644fcc28f07d394ac/zuledaruwoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tem+como+aprender+a+tocar+piano+sozinhoPDF 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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 19120 bytes
SHA-256: c02e7f3b846acefcb03298ab42b8b2fff053bf82ec29c785ce0d28e2ddf11ec5
font_02_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 10756 bytes
SHA-256: 6c11a53d7414499282aa7276f8d227f1dc323dd699c129971ded900c9a6dfd46

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