Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2e0d3a2fe88bf0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 17:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39a21bc014ecf17b25296ac6f7bc7a71 SHA-1: e4477b6320dee1003b3235efeef1a8067487dd91 SHA-256: 1d2e0d3a2fe88bf0c0483b00499f73387a041ebeb62328b459aa95c1f0df9e0a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to facilitate credential theft or malware installation. While no scripts were directly extracted, the presence of multiple compromised CMS upload links and a high ML classifier score indicate malicious intent. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142e67720f5b---topemakomegu.pdf In PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wezodapi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/xurarovavusotudolitama.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/gijerugevekora.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/157d38df5c5d620a8a88f282e3726123/mefojulusuzizagafibapi.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/sisij.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b6d94a88880968b22396f42145e2d4c3/makepiteji.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/aa0da0b4e5cba3e05e26147a9c8eea46/wubuxugimiwagumifoj.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/54359691736.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/xukemugefufasevasan.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/ratelokenupiduteb.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/25285475405.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/zejabozap.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/45550933007.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/58207261013.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/17569528189.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/rofinawatijivabeji.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/63714985944.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/50508290224.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/32804540443.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f21c17fe---tidori.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417e26f295---mofasexazaburowezama.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/51571649250.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/vozajafivoveto.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/10832712389.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/97225220427.pdfIn PDF document text
    • http://kleiberit.ru/files/file/20444396644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+chrome+videos+in+mobilePDF 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_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 10916 bytes
SHA-256: f85b0ce5ec192e6b4c37c82a5ca9fc9ba315c92d9fa42af957b0a915a89475ad
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 16560 bytes
SHA-256: 7aeba52dcdccf1a17f70d095a702b7a7764a4a44ccb27d48b4668df64838a1ee
font_02_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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