Malicious PDF — malware analysis report

Static analysis result for SHA-256 b692b4344e61613e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 03:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56042f812d614e5cc6117841088d1012 SHA-1: d02386417f53350166d0ee4a08cfefe347714936 SHA-256: b692b4344e61613e45a41ad9bb4d0e4b3336c30c704b3ce0c5e2c0fe75fb2f95
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380b844561e---fifijidev.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b035cf43---53658293327.pdf
    • http://rnralpha.cz/res/file/kebitoda.pdf
    • http://bensonlandscape.com/editorData/file/funikunemudi.pdf
    • https://cheesykeju.com/contents/files/mogamew.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/55618481405.pdf
    • http://tekizolasyon.com/ckfinder/userfiles/files/86536086822.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/71113061196.pdf
    • https://chief-moving.com/editor_upload/file/fumefupure.pdf
    • http://natpuedu.in/userfiles/file/6346655546.pdf
    • http://valdhans.cz/userfiles/file/sopimo.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/suzelakatijeduxa.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/baxobidijeku.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/gapilotazi.pdf
    • http://www.520amis.com/upload/files/bimeka.pdf
    • https://lostfoundglobal.com/userfiles/file/kamewapefalupofuwu.pdf
    • http://mylodge-naoshima.com/43511134662.pdf
    • http://asupuro.com/user_data/image/file/15308470486.pdf
    • http://marinapogon.pl/upload/file/9781230778.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e32c767a6---14362781274.pdf
    • http://hstechno.com/userData/ebizro_board/file/11903295426.pdf
    • http://mylodge-naoshima.com/images/blog/file/62504931238.pdf
    • http://35ct1.com/images/ckImageFiles/files/78205823929.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ts3+clownfish+plugin
    • 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_off0000dca2.bin
c2817b174cde6c31a2065fa8b977243db46fdda66a6b54c120f545996ae0ed34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 18128 bytes
font_01_sfnt_off00010b6a.bin
0b3080d067fed92749e4df838c61a380bbcffa3d7ad7b1b42ada0a1d4e8528ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 10588 bytes
font_02_sfnt_off0001239c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 16792 bytes

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