Malicious PDF — malware analysis report

Static analysis result for SHA-256 6174fef1695cb65d…

MALICIOUS

PDF

76.0 KB Created: 2021-08-21 01:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1149eb0ce8c05b94b2b4d52047a00777 SHA-1: eb4ce1fad073130d2e47a0c51d0c2047c93c597d SHA-256: 6174fef1695cb65d0e3a6efa737e8223dd8f492c685dfaacbca9536c8e47209e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external files and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The presence of compromised CMS upload links further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://drapa-technika.cz/UserFiles/File/lumapelakejoboluda.pdf In PDF document text
    • http://coiffurenais.com/userfiles/file/28470800180.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/79476252320.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wakatofusidesut.pdfIn PDF document text
    • https://foulardfotografando.it/file/82058129131.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/mefunobolibomazovabunuzo.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/8199291157.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5631a38684---mosogixunoj.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/gowetojofap.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210821050240.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/naqhihjb8vtgsdkl8957c198ih/gerutaze.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6a7e2d57496cbf8e1b1aed5e91b59d5c/kefutov.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/15b1ab5da6cebacef3c72c07897d2b5f/nevajuta.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/74070680189.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/mizepav.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/95098220986.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160762b77def8a---jogavenawekixegatojuxunen.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3127addc2e---75299016394.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/20591586229.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66397e9464---9411297719.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/41603872989.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/temejuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=will+going+to+future+tense+exercisesPDF 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_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 10544 bytes
SHA-256: 55bd1e7f40bd0c5e2efaf7a3168cc1304bccef5c8875cd3641222111ec27e323
font_01_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 16584 bytes
SHA-256: 2fbebd5022309c4c1e354c308da3db4eae07192110b0b90c70e2e09bbea470ef