Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b997baac8d83e9b…

MALICIOUS

PDF

96.1 KB Created: 2021-08-04 09:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c40059f0a516dbe065c07696b6c35c0 SHA-1: 66bfc1872f0ffa6c211f77e48e7dba4fdae9220e SHA-256: 2b997baac8d83e9bda9e67ddc4eb2e875aa7f6f77b8fd0115d61c3cfce987a92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of these links suggests the document is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160740d5f5ea77---92264046570.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef3babf92---rowipalojenabo.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818cdc16dbf---6896358576.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/jerin.pdf
    • http://ghalemdi.com/userfiles/file/midupoxasejexa.pdf
    • http://kameleonhastanc.hu/files/file/86766070429.pdf
    • http://kasystemofkarate.com/clients/861259/File/rogutovezegaru.pdf
    • https://stka.gr/ckfinder/userfiles/files/16518704822.pdf
    • http://kpdb.org/userfiles/files/fezimo.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/dudizimota.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/29156f9dc283a368f35b6a216227b993/31982855865.pdf
    • https://bursakaynak.net/userfiles/file/7351415174.pdf
    • http://novichiha.ru/pic/file/63651622918.pdf
    • https://picinterior.com/ckfinder/userfiles/files/lozotupefefubav.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fc01e4b55---19946466277.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2794a5cf07615c91ee97d0601bedfee0/67711089901.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e57c49d9---dadakupojadifusunivod.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98753deaa---mofenajobevavubevoxexi.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afafbf58bc7---44376172360.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608758547c1c7---30416857232.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c57d09129ad2a7f20767ecfb8b301108/rufudof.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f1889745e---45285795998.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2q03mcqmd4dsp3mark26susolm/lagujuro.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef565cebbf---47089414786.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/xiwilunexezigonexo.pdf
    • http://perfekttorun.pl/pliki/disagavibopejebumedesera.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sociologia+anthony+giddens+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ff5.bin
c6c544b115f957f66ea977c5dcec058169b9623e58da4194555db58d4dda9280
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 10988 bytes
font_01_sfnt_off00012936.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 16792 bytes
font_02_sfnt_off00014148.bin
471b70e36adb4b7498afd57477d8aaf35162628cf61b0581a9b711811137bf6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14148 18508 bytes