Malicious PDF — malware analysis report

Static analysis result for SHA-256 261e33ba5eac00ec…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 13:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebd26322608e6fc91e08cdf85d81ccee SHA-1: d8eb608553557bfad687443b0ea4ae8247651cc0 SHA-256: 261e33ba5eac00ec60af53d08b51bd048cb6dda7e8588174b9d4baf2a2bef913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=tipos+de+pseudopodos+pdf PDF link annotation
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/42859330dd1be5c4881dedcafcf614ce/dagivubosugijaboz.pdfIn PDF document text
    • http://mav-auto.ru/images/file/roraselenofinokapogukux.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607734473b0b6---85556253081.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/51748289278.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7db3f1c14a843f31bb4ecdcf5defbf1e/vofikunewokexusukowev.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/43883568509.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f174c22dae---31598285456.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160940b28e26a6---46114814946.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/regoxozakudazubarasak.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/37599447719.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t22fmuvm13ll54bk0togh80imr/dezezadujovolufaxud.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c21ca8524e6---32501350436.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/dakifojakagoz.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0f2d5e6b---sewogodiwedupoxivonixikus.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/45195090986.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/68074339298.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/20475423045.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa39d0b5ec9---kasedivaxezuxumajefuze.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/69539093698.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/migonevovixopitafakobenoz.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609099a153e35---jodadonuvovowifupuzidoji.pdfIn PDF document text
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/16788293050.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6mnjofl9dehsrji4e53v90vr58/xejibefolu.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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 18460 bytes
SHA-256: 2ba4157921db32177cf3c071f4404c476bf38712f3365e239ded6533c5e36e40
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 10044 bytes
SHA-256: fe11fb79ce13326aaea277b35186c18952b6e0b70449ec07b680fead598fd701

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