Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2481a82620a4f3…

MALICIOUS

PDF

97.4 KB Created: 2021-07-30 02:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a40c2ba019cd915366aa0f064c09b27 SHA-1: fee87ebddba520d5fbe55995c273d696a598985d SHA-256: ea2481a82620a4f313b420649973fc418191a3b41af2e63fad4d813fdb709cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://philabc.ru/uplcv?utm_term=nfs+payback+derelict+guide PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5767e68baaa2bcdf78268e6df840e702/buvoxijepexovanadi.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/wixasenawalatim.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a04973cbf00307848d56a4d7b76800e6/90930392078.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa52203391---gepakobonamexuwagojogupo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086945d4ebb9---mifovikomavikena.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/mivuguxeradufazofog.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/6141994199.pdfIn PDF document text
    • https://area5srl.it/file/xitonatinoxa.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/zigir.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/paraxude.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/40049196600.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/sasolenufe.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/20494155126.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/58771867454.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/jefadanunojirikesutoguze.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bfqb9rsdc5r8c0ncvht2a727ro/41213935291.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gi992d47kut59te1q44s1523nj/75431580661.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/zukut.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160714158dd096---63814466320.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/n2fj3u2vplonjumua9t1hjmpjm/nuradorawazeti.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1f5b82f2861c1b2ba902de804a224cdb/68784882351.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/tlsjo39ffj600eqcv3f97mk180/63439925197.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/ropamobeba.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2415f62bfa3b3b43000327633cb77b1e/77750090727.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f77635390d---buripijagedotuzawo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f0a5aceca2703accf4efba97cae73fa8/19407148750.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b036770a755b453d917afefd975597ff/19994494746.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_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 21140 bytes
SHA-256: ff9f0a7b4b7700a65caa99c315a028a04427f601334f569459fd423c3e25e7f4
font_01_sfnt_off000145e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E9 10992 bytes
SHA-256: 63effa49c99bd56bfa4f024e495b36d1738fed1fabf6f150f0f24f9aad1f47a3
font_02_sfnt_off00015f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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