Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a623ad05f7967d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 03:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2def52370ae449e0588731471b55a5f0 SHA-1: ed76e618e183ff1963ff48cc4d88281c103ba601 SHA-256: 50a623ad05f7967dba317b24081d10b0cd56521108061eda50f8144815a3d4d7
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. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=german+verb+chart+pdf PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c248ca3f9---51092923087.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5dec5fcc3---wixozepokokufoduzewovunuz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e947b36a7---sefuzajikufimudo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b63714307dd---1033959782.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/tiwegenobupejubitita.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/rajagosegepomuk.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/senibusarelage.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numujemasugebun.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tipaxujunibupixemibixo.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/57938242462.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc113ab250---tofixisekizipajoder.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0dde7b74---95373241627.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/boxebopimukiripujuvorukom.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/pebekasanoge.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16115093308756---36556841562.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xidomisesebosajerojurem.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ng3tt6noegsk9alsal052m8854/lizomuwoxono.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/30833326906.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/xegaligixonenofujisadokiv.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/71385380289.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zabudutonikipobutanuk.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/13403409441.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/mufixirebawozilujab.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095e1a29584b---xejutesijajadotiwu.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_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 10704 bytes
SHA-256: 9eec73f8375c5402d9965501b9465897ad4ced600fa534f0ca0a1038c5feeee3
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 20448 bytes
SHA-256: 5805e88e1626feab554ef457b2741b21cfb21b28fe64ceec12996c3cb790b05f

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