Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dd741cb49eae5d…

MALICIOUS

PDF

86.0 KB Created: 2021-08-16 18:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85414e7004de11111d61c6f06e9c50dd SHA-1: 7ccb80aad644529954a88ea56d675e9efd5cb34a SHA-256: 37dd741cb49eae5d550de241468ba445b0a2cdae0091c2afc3d7f2f72b2cc8f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, but the presence of a link farm and the high confidence detections point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/68c1f4aac191397b8454b97271aaf3ce/kekusagexufik.pdf In PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/262f17f61d8aa633692ebc89cfe6069e/87255637490.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/67303607585.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803819655d0---53818124571.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ed5de4612---jovozuzifafeb.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b94398896---dupeb.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdc6833e2---23825707570.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/2d19c369c45a6b414c2e1f7a0ef6e774/lapejesarok.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b14c0540c97de5ce5900fad0b8ca4cc6/guwamamekale.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/22458966579.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/jevodidexerenina.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c021383bb27---99506462628.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/fitomuzutanow.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3113f980---6637753341.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/buxajavazevedifuririmen.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/9637150981.pdfIn PDF document text
    • https://banghenails.com/upload/file/nuxakulalonijilunimedivot.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/finopimite.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sutsqh8mb3ukf1qfh3cldg3nf1/57660367423.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/livevusesirobogabad.pdfIn PDF document text
    • https://datawire.gr/files/files/44165236173.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95af93e4e---zitonumulebane.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5a33957dc7353f98fb9519988a7f5366/tevimujog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b2e0175a---dimaxuloziwuvobejusevake.pdfIn PDF document text
    • http://nova-auto.com/upload/mujux.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/3135534790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+unlimited+gems+in+carrom+disc+poolPDF 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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 16968 bytes
SHA-256: 6ebb7fb6f2e453c908bbfb9181686c364fb6986f87fc2e4d91d6e6c0d319b71b
font_01_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 11032 bytes
SHA-256: eeb803e90c0a92ab50ea1d2ab19117408d7f4d5ea81570898482d45a617e8125
font_02_sfnt_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1