Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae87780db368a58…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 15:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a229aaaa1d9ec63ce11830897027f06 SHA-1: 4a812cfbd5830d46161f43901ac0e57ae62ba5be SHA-256: bae87780db368a58055c0902547d8f06a074c2841dba14e1c7d11b6676d049c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting domains, suggesting an attempt to lure users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of link farms and compromised domains indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd373997d---dupaduwoj.pdf In PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/36568783871.pdfIn PDF document text
    • http://cartopack.be/Images/file/30628333681.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/votosubobipibizop.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/15295144910.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/54718338027.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/jowedeludo.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/41202757614.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160727c735018e---kupiwikinuxewura.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/28399510121.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/95086634294.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/wazutoripabizo.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/83580274397.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6441las9i5a9mdamm69k9ggd0/modipekonekutinusazidowu.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/jobolavizowu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb706262dc---jofaxobisirunowubezo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac036c1fc---83241468402.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f655fc32afe08b668c209cd7f0100953/26714819911.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16111a777157ab---15056631574.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ed79a9d0---6488007694.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec510d9997b---feragivujosoxu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ff93b319e4756a6712a4c0cb1c64cb12/fomatidubulo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pts9pjo36lv6dgb3nqdgg1um8v/lesapifimekibuvusapabodan.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161266003ec4c6---95921839289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kia+rio+2010+service+manualPDF 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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 17888 bytes
SHA-256: a9910c7e1438d0d002d9a53c915690902066fe1d85a349d238f0dbc76baca0ee
font_01_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 10744 bytes
SHA-256: 3b88a523defe2634d93022f28ce269af5cb7e207cc7e48684ab010f8428d8af0
font_02_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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