Malicious PDF — malware analysis report

Static analysis result for SHA-256 45340021dfa76463…

MALICIOUS

PDF

87.6 KB Created: 2021-08-03 09:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7861e529b6097135d179d136c5f22df SHA-1: 6adc4f16116dc1038274d6bcae3d39e35160a825 SHA-256: 45340021dfa7646389905f54b913af2094b8c49fb1bdcf6bdceca5c1cabd5103
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. These links are likely intended to lure users into visiting malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=problemas+de+energ%C3%ADa+cin%C3%A9tica+potencial+y+mec%C3%A1nica+resueltos PDF link annotation
    • http://gopherandsquirrelcontrol.com/admin/images/file/54249714463.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5023c2174---52327188528.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/73980181010.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j26o8552q1kqjorcdpl38euk91/sakizafirizabepude.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/57abaf692ba8e0f86b59cad6899c2d76/manawerebuxonitobu.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210723151234.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/tewagekosoburidos.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/75513190070.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/loniwekoxekijujuweg.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/83d0ad7edc207d5c6bce7476a5b9769e/87835157813.pdfIn PDF document text
    • https://digireg.ch/upload/sevijuvowokesisejadon.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210611_14ACA705E9D13B05.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/jamavisirojoxixid.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/67458096487.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7ef1vm2o3n1btvgc0k2n03sdbm/40699336016.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/88ea40c24adc306cfe6fd1de79f1fa11/kufotazereba.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e18a0bcec06e6e5d8c4a3f4b8080396c/41122578261.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/34586552524.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098c19c90759---17389491346.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/61442457667.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1627205093.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/palajav.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/zixuli.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gobafegulapus.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/65769312582.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 18004 bytes
SHA-256: ccd1241c604c3849b8df881fa3ab3ad885a96e0ea7a9c4fef0d2106666a1aa1e
font_02_sfnt_off00013332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 11608 bytes
SHA-256: 835d9b9938a3646d7a0b8fddf7271151b1164983a5821077b03e272e957404a6

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