Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f08c33434214e5…

MALICIOUS

PDF

107.5 KB Created: 2021-06-25 15:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 722e9377800f5cea000c74193e42772c SHA-1: 1ff2e596b034cc7f704e08155539d708c6b142a5 SHA-256: 21f08c33434214e56ed38a203b8df84b1cebd5806357b4c4500780a4ef4091f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm or phishing lure. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used for malicious redirection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1c00513abacb6bb59cf80d7c285e45ad/39625131555.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4946177b9---zitejibi.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d4c09cc69---37424047531.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/eefcfc9d5138f9332c6f2ac3cc553f92/winenadijuxefumizupevo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818de7cb618---85192307228.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf8d91cf3a---fodumikudizejokuniwowap.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e40384557a---lubenodenovibugosisugo.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/45a63949e162f66081b407aa3a8889b5/23405885415.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076182bb736e---2988223544.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed5d3e435---96460618768.pdf
    • http://travelshops.pl/userfiles/file/81675573660.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be5d1ec03---33819999996.pdf
    • http://greenbrier101.com/userimages/59552977828.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a637bb43604---21609711168.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=chanakya+in+daily+life+pdf+download+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f7e.bin
96d4307d35c331be439fb49dea7ea03118d7b280a45bfbd402a4bdd991c17d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7E 10652 bytes
font_01_sfnt_off000157d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157D1 16792 bytes
font_02_sfnt_off00016fe3.bin
5bfd33be994a903a015ad6241e05e2ff08a086651fa11ae71c5fa66ad9fdd821		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE3 19380 bytes

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