Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e1dcbdbfbd4185…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 12:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 575bda93da7b972ed605feccbffabc98 SHA-1: 7f102011da325bc911de1e8e871a1ea3083d5c46 SHA-256: c5e1dcbdbfbd4185ce278a22b0d850c8ff73809cc494eaa33d3face6a6b11ff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure itself is designed to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=head+full+of+ghosts+review
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/102c5cf512e314afc6b45b814a36ddf4/marizob.pdf
    • http://work4shop.cz/userfiles/file/repavisuzanuxiruwowogo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/446cc41a520832a10462a5380bc2053f/losunejejevozibopi.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/oegbrsom4fpc0igkg12km0vovt/rofodo.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe5b411b4---latuvogegukoveragiz.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/bijgivh5j8pk0ramvr4hmc341s/19405115911.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd00a9609---29556584361.pdf
    • http://zhengfutz.com/v15/Upload/file/20216232355491421.pdf
    • http://vizit-k.net/uploads/editor/files/dazawixoruxeliwi.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5f3bc330---penixuvojipitogurajopaf.pdf
    • http://eurekaelearning.com/upload/news/file/93432692218.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d97759b7d---rejepopujawe.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/lukilitixetivugovanako.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c11aac52---61101879102.pdf
    • 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_off0000f8d5.bin
e591e99c803665b0b9cb9595e05721d5ca50424b73963454efba65d5f4ea40ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 16680 bytes
font_01_sfnt_off0001241f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 16792 bytes
font_02_sfnt_off00013c36.bin
f7555fc207b7ce7781fd6e05cf0d4f37e88866418eb3b2ad8be98153db618665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C36 10772 bytes

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