Malicious PDF — malware analysis report

Static analysis result for SHA-256 2639a3f0aea7dfa6…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 22:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71dd66683a971889a30420d8d1a7a0af SHA-1: f4e83e3e7cf0bbfc4feaef7904cc1f01a6b0eb02 SHA-256: 2639a3f0aea7dfa693359899efd3efc467c4af6247a6a9249df4775cad72e388
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting domains, a common technique for phishing or distributing further malware. ClamAV and an ML classifier flagged this PDF as malicious, with specific heuristics indicating it's a link farm on compromised CMS uploads and disposable hosting. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://aiswaryamatrimonials.com/fck_uploads/file/wafagerolewujigi.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6d60f6ed1fe0a516c7b98b17da41e016/5384570750.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/pizulewobokufukemiv.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/671886cc72988816dea49131b3941f10/rakab.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/43365668995.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/16d4ee684ebf39599bd0bddeb00281de/bikujafusora.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/86979464210.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c67a6f5c4---nilewulekepe.pdfIn PDF document text
    • http://billsky.ee/files/file/66675188540.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/83110544237.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/40047005311.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4df4bbd990f558af9d0a3d25dac7f34b/jinamugolowafak.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/18921921492.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/ribogeremosujuw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f708d2075---10616424895.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f79c0adf---76579472506.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210626114552_nd04hv.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/48588905994.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e4fb34bdd9559442900810e68de6142/baretekokuk.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/80da83db0f819691d44c965c0190edc4/4946936004.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9002897723---wavumopuzatotijuvix.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a704257f43bdc83330376cdfdcd33b03/58125738078.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160795223320f7---varonuleropizufovetu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa23c8d90f---96295498338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=java+check+length+of+stringPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
font_01_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 10764 bytes
SHA-256: 429f2b32d725ba1fa5a1883f26ae50b8e414cdc914961cd618537b643a3d85cb
font_02_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 17692 bytes
SHA-256: 08a746287e0a6f841b0114beb4e999019d988278c62271aa19078565d201a2e8
font_03_sfnt_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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