Malicious PDF — malware analysis report

Static analysis result for SHA-256 675845ba41c3654c…

MALICIOUS

PDF

76.4 KB Created: 2021-07-03 17:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aef61946d5868290808f6050742b2e49 SHA-1: 548d51e1414c33209711703c07416365b162580f SHA-256: 675845ba41c3654c6d65118e83ba7800cfa026d9a2fcc74ccba51b831703f589
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=travis+cottrell+in+christ+alone+with+the+solid+rock
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dfa69c9cfeb43e9904b92d9b35f1fa23/ronomenavisanaro.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8790c674771e700ec83b1641b3b25e08/79711823321.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210629_27FB060F21D9714E.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e596a232---51784371449.pdf
    • http://sarljarry.fr/userfiles/file/rurovase.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2093282e---1242644275.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608429ba1ccca---51490539034.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/fotepezedukifib.pdf
    • https://twr1115.net/files/fckeditor/file/fobowedik.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7beb126be---risedakexofenosebimowaziv.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/84703273318.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/32s2drq438795qtqk3sl8ssa1o/5374922121.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/satagararabepexum.pdf
    • http://szsahsh.com/uploads/files/18889997755.pdf
    • http://ildongwire.com/userfiles/file/67366191773.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e8cb53a136e018d3e4a02fc6fcf50d11/90383932856.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36c6d7ee5e---61682863231.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/54ccdd7f541e2256d74c15b10740cce2/11400324176.pdf
    • http://shqinze.net/admin/upimg/file///foxajadutoruji.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c9661f52---91687287460.pdf
    • http://nhs-carpediem.com/clients/46367/File/zabilot.pdf
    • https://techson-cctv.com/upload/file/daxuteluxisezigob.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9829adb4f0174971a7de37549a9405b7/98109914247.pdf
    • https://rybczewice.pl/userfiles/file/17302147861.pdf
    • http://adveotec.com/img/file/tazezepovasoritibumirumo.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084bba9adc29---likasokufora.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_off0000c318.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC318 16792 bytes
font_01_sfnt_off0000db2f.bin
890f71182f9baccd41725a35a9a1a87738716f6597ecb7234cc7c50698f263e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 10676 bytes
font_02_sfnt_off0000f3a6.bin
ae3531e0c22d575881cdd0c7b43f610018ac6d72c0d4f6cd6ca9697f20f2841f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 17480 bytes