Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58847bff6b31121…

MALICIOUS

PDF

94.2 KB Created: 2021-08-12 23:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2f7c135ebe28236abb3d947419513b9 SHA-1: f117c034f9e0b9e3a65bdf7051a087b08e0e3aa3 SHA-256: f58847bff6b311217830ff95977aaa951e768eb5bb6463b131160dd0cc16edf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://catamma.ru/uplcv?utm_term=jose+emilio+pacheco+las+batallas+en+el+desierto+analisis PDF link annotation
    • https://kede.org/userfiles/file/dezajokejim.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a415df41b36385209498ad7f8c5c9413/55423377648.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/10d739ff38bf3cb9a02461db5a11000d/najusorutepe.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/q55d5e1csitdhmr3n3rhfesj94/17180947274.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/39748215507.pdfIn PDF document text
    • http://babamoleskine.com/files/file/puwujowijigawirigav.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/03oevg7bmqi9c0c04fcl6s86k5/49573061102.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fanaririzomutunoduva.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/sigedofudegapevukezexibeb.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/15826780572.pdfIn PDF document text
    • http://masonhn.com/d/files/49243123607.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/62061744702.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/kivomupurivijix.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/b05bc59b6749f54850ce738569130f5b/71919531181.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/kefaporedek.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/72075383264.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/24f2c90cd65edb4c4405cd7cfe498684/fojab.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uutb6mhj7cdnlhlii93hs0qd90/nukop.pdfIn PDF document text
    • http://teknis.it/userfiles/files/41778800083.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6023c0bdfe---guliwik.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/rodevub.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/duvezunokosijirekovatemix.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9df02117---3747850514.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://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_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 18768 bytes
SHA-256: f446ac7fc0fb8c39f7f73b636861957b4c98376388654600b0ea6d0c1b1de8a7
font_01_sfnt_off00013bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D1 10912 bytes
SHA-256: 7e09e6ce0a6b102030ba12d02a5ecd4ae47539ec70ef50a55f2ed4b96a9190ca

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