Malicious PDF — malware analysis report

Static analysis result for SHA-256 836a3e06bf6b24e6…

MALICIOUS

PDF

89.3 KB Created: 2021-07-08 07:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f04870664f0ba03d8f7c5ffec18c1e4 SHA-1: f7d9d5c4746b93c7a24b095a3ab3fba0639a0690 SHA-256: 836a3e06bf6b24e6e551cfa784d0789c971a05206a73fc63eaf9fb2fcb73fb9b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e2f9ae7199bfc72b2ae9d3ec9f0bce5c/27125772678.pdf
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/76456647420.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/lekebibej.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210629074621.pdf
    • https://audit-advisers.com/userfiles/file/fumiv.pdf
    • http://praconsulgroup.ru/pict/file/50570975808.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0be20568b---23022202247.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/e60e4aobree0s63ehj8e46l9hf/zoniziv.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/014cae639e4bb90e6a0410323be0cffe/51678243207.pdf
    • http://atthaya.com/file_media/file_image/file/21786343784.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/1c2845389a9626ad5121b909465561ad/80236871934.pdf
    • http://unsersohn.ch/images/file/37063751880.pdf
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/voxaxedok.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/bf7d1a985591d7c7a57992dde8481a45/74744376826.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857646ae4e6---tedevuguridijuweni.pdf
    • http://wabasnb.com/files/fckeditor/file/88978306760e63068d49ed.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e70037606---wujakesorubuzexif.pdf
    • http://brandiassociati.it/userfiles/file/pevadujikuropawu.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/79e790428ffb364e5aab6a245444aad1/firened.pdf
    • http://www.celso.org/download/likobiki.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/8ebdcfa3fd59ab4bd9a92615868193fd/vejufilexewobolof.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada95709044---35597576486.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=21st+century+learners+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_off0000f846.bin
37b12cdbb40ba21676891b6e5a46d533be0d59d8a2fa1da88dab3ce063992a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 17480 bytes
font_01_sfnt_off000125eb.bin
3c2413f226483bd40aed071b4bf6315047a378859ceef4a5f7ed6a44ab51548e
pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 10688 bytes
font_02_sfnt_off00013eb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB6 16792 bytes