Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5c5e26f8c78e39…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 08:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 264fbc526a2deabe6b5b60b08ff4214d SHA-1: f660e6ed56545113cb33a24a54ce8553cb2a2bd2 SHA-256: df5c5e26f8c78e3955a02b1aa400dabfed0a2b19355d515bcb3ca9bc3b7b13b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms on compromised CMS uploads points to a tactic of leveraging potentially untrusted hosting for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mwflower.com/upimagesfile///58622055336.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a2e52f3aeafc6de714a8562e43255a31/5619786577.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65b04f91f---fotefelunuzafinubazozenit.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vevekukixulokivo.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/edb3339440dc1bd5949e67cdfdeddd57/bufapijabozipur.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/b32nl2a95qbbfindf8js13gupm/luseparojakuwaxivubonot.pdf
    • http://akinmedikal.com/uploads/file/dafefojitamorez.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0d0abb80c750480417fa296924e46784/62016012927.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ff5d4935---61597126697.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/u3j0rih670lv60vqvra429g87g/resitufofejubuwaze.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d7b16eaa568b95f50df8f706f9a91934/norovu.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d20677c6---xumojanulenalenu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8011d163---4979275118.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dd328b435114eda32b9d0029e900f3d4/90459343324.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dbb563953e8d34ee2a301feab13a1fd1/kibodejasuxa.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8r9lve15vp1h9i9he7j4c1tvn6/wuvarojujemimivumaf.pdf
    • http://pospatrans.cz/UserFiles/File/kibaxagorewamubo.pdf
    • http://imssp.by/data/images/fxeditor/file/gojakopipejozobom.pdf
    • https://habibitours.net/ckfinder/userfiles/files/temebisigevewukunufa.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0c8cf5a746d44f373b3a7b8aeaf1e7fe/57954903499.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=2pm+pdt+to+bst
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ff.bin
241e4d8b416428189ef2cca819c6a973e7d3d5172b46cff935fba159851a0473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 18272 bytes
font_01_sfnt_off000115a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 16792 bytes
font_02_sfnt_off00012dbb.bin
ccf0766ca24272fc912d7907c1c77a7d4815806d1697b5f0636fe4b3cd58b20e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 10080 bytes
font_03_sfnt_off000143f7.bin
2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143F7 16204 bytes

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