Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62f6feb6db9f28b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 05:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4f697e22f16f16c7563082e5de1b25a SHA-1: 594f2c9cf6502a4cc4fa8537d41d6e5381534771 SHA-256: c62f6feb6db9f28bc080189d1317d87a82dfaf9da9a90fa11376597d220c4f44
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicative of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=451+degrees+fahrenheit+book+read+online PDF link annotation
    • http://baiduvpn.com/upload/files/zesatuvivanatuvutis.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/45147817162.pdfIn PDF document text
    • http://all-premium.com/user_file/files/lulorawe.pdfIn PDF document text
    • https://promise-land.com/upload/file/95655314541.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/puwomefivufomuzixinas.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/33624152083.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161470382f20b0---72562250440.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/24574196903.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/raxatalupilaluwirenenatu.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/fovoxalasamafojakaguzexul.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/mubukosatix.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/fifelinidexubogut.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/molilozidedufiwa.pdfIn PDF document text
    • http://rafaelokazakov.com/file/45854617230.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/bogeginisi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4ce9bfec7---lelejubulepiz.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/zudofuzivitakazoga.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ae1fpnqk5vq3qjcm575s0ia2t0/69650562412.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/dematimuxerupasojanud.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/35222123804.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/zokefenefizomekudi.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/zijarivefuzeralaxinileke.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/gelokovixede.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_off0000b1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 11032 bytes
SHA-256: 98cf855355c02c0fe543f2d62fafc2a31e07febe5790924dcc071b6fd0b45f5a
font_01_sfnt_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 15660 bytes
SHA-256: a254d84be0d13eeed9dcddb93491197df7e92792616aebd0251f041e9b76b86a

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