Malicious PDF — malware analysis report

Static analysis result for SHA-256 371c0e4287dd8960…

MALICIOUS

PDF

85.1 KB Created: 2021-07-05 03:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f9b2ac58875241ca3a6447d454bcb56 SHA-1: e590f8f6be1acfc25e43fd694e4489d7c12a9f4f SHA-256: 371c0e4287dd8960bd7f0e0b4a069bd29cabc71d7f4447dba7a38bcdfbea4661
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on compromised or disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://makinsushi.com/uploads/files/junigebanigasirepikogu.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/367d906d79fa830ad0aedae6302ff5b0/difaxixupetatemu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9ddd8439f455b813afb0da8cc4da59b7/fixokosagufuzed.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/elmfeue84ndkqosaintamvld2a/jatan.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2a3465a4b733c2b1d7e1667713f66c4b/vinaka.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160820add98a0b---9156937886.pdfIn PDF document text
    • https://jotelek.hu/files/file/71831464373.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/21536726535.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/fekipiwaxateramelojem.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/87414052963.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07036c1666---26543225590.pdfIn PDF document text
    • http://sns.hu/_user/file/dinitajegen.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b5f6ea67---pofipimusikabinedosovuxil.pdfIn PDF document text
    • https://hse.tw/upload/file/tewikaraz.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/89463984267.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18de06dc1---96190973107.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/91900688331.pdfIn PDF document text
    • http://classtool.info/upload/files/82746917030.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/452stakq2vvqeb8kpl5cjqphjr/gasomazuzupotezikefewefes.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16099b242c5f9a---nexuvuxirarawuxuzirolupa.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426fdcfc45---razokirubojofojovukikokop.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/midigemorojonodadabe.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/23734648089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=family+poem+in+englishPDF 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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 17212 bytes
SHA-256: 4f1b174f7897ef9c887553aee5612f04526810f518ead02a3d84861bd16bd339
font_01_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 10592 bytes
SHA-256: c1a969a9e6c0987f02a090677ad938618d072948de3bb2f845c38697681c89e2