Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c65ec4857de2e08…

MALICIOUS

PDF

93.1 KB Created: 2021-08-09 06:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eaaa8de82c94e3b2048194a6fd0d1d78 SHA-1: 67f433f811d39828b4209a9000204c2774d00c7a SHA-256: 3c65ec4857de2e08c0da09b8457e1f6503d0726e3a387efe80ec95d788cd2162
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains, likely serving as a distribution mechanism for phishing or malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious 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://pistant.ru/uplcv?utm_term=what+are+the+negative+effects+of+using+corporal+punishment+on+the+learning+process PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9573c91a1---sekenovitotekuzenor.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609573c2e6a61---68234148129.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aeb9c8f053e911b2e7fe7cbe43611cdf/bisix.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/bemisisapekozamujoketud.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/t8d6cofsd9ugpdae8a6le5vh12/fiwijisiranaripe.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/relogowewevedezoxe.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/wesowepavesejebusoviv.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d365767aad---1464843360.pdfIn PDF document text
    • http://sushibelovo.ru/files/fotarapufivizuzasufesi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j3mfcack2jtr2gtft507a8oa32/powuw.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/gixijobosojejelusoragelus.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/78976274230.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/lomedufiziwik.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8070911d6---lanizinagugekizumoku.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/zitonetakekibesato.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/37494579699.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/dusafizu.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/19024071282.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/nibamib.pdfIn PDF document text
    • http://kleiberit.ru/files/file/89578265220.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/57649f174be43388c8f792bff578298a/97627728047.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fd06a2ab4c457f5159aa2e4a4ff1444f/mosesekumimoxomif.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/2549636400.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ef97ca742---76022722676.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_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 11088 bytes
SHA-256: cf3f412e7688c537db31618803ee2a5166e8022d016f6ab862145dc2b691aa66
font_01_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 16888 bytes
SHA-256: fa8f339e3425e70df13ab9124be822372d4fc320032873af171c1c60cdbe6499
font_02_sfnt_off000149ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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