Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a82039eccae9bdf…

MALICIOUS

PDF

113.8 KB Created: 2021-06-26 00:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2351975b7cc40a107d1a23a30fc5d230 SHA-1: aebb6aa9b8cc6026a2dc5402d54611ed07a035ff SHA-256: 3a82039eccae9bdf37899d461e3156f35f156ea32faac839e4af582109f62d0a
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 file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports the attack pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://coretry.ru/uplcv?utm_term=adjectives+that+start+with+b+to+describe+a+person PDF link annotation
    • https://cornerstonelaw.eu/userfiles//file/ruluwokixemorij.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/zakolatijeluwenex.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607487aaf4001---4670355926.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nusofopemanotepe.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1310769a90332255a1e5ab15288fd5da/zufuzalebovisox.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/17313995242.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830e1bdb4d6---92197961883.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3cfbf297283ca3c75e977e6575b50d4a/wewidilir.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/joperewagoxo.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/32750792471.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb36c7c622---dovagakonewonenibaxaleb.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/34782709054.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d311e9e3---23064028426.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/39897402600.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/vawuvijitipegabu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940018958ec---tusemaxasunewer.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/908ae8f893024d893f94eca0338b01f3/26333387874.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92384c1e7---8909545260.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/53572708464.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5fed2ca2a---luxirelig.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63de0ac66e4f98fb32eb1dbaf6eb5c17/rewideneku.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc42359b15a---wawevubegad.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934255f0ab5---losusesorarazedugelizez.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04d6df056f---70612010171.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0d0a9b26ae1c1f5b418ceb67c2d258eb/lilofibemokavanu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/tl7hcavkc914l3r69k8tntkd46/xixofavegulaf.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/cgo9og04bdorbdfn6oonia6o92/gitopemutipudoruva.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_off00015d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D36 10968 bytes
SHA-256: 0f8996895599f41c5a937ab6e6ee3adf8a73e38c702b736775b54cde1235efb7
font_01_sfnt_off0001766a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1766A 16636 bytes
SHA-256: 867e17122dcbe487a90f148622c32672bcb5694ec2897bb139dfd7b11b1ac940
font_02_sfnt_off0001a13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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