Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5a842a265a3231…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 13:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49e1534c5019c80e2f4b4cc8c7b46c24 SHA-1: af4fe6ad1a2732249fb5f878893f9fdd56fd665d SHA-256: 9f5a842a265a32315e63e01242a7fbbecf4f2176f2ec8901409c6add861c72c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=how+can+i+get+pregnant+fast+after+my+period
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68231edd1---nipelakobukesav.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/fa8c48b92f5f98a09a1fdfedab0bfb53/85312793494.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b3c4c18cb20d811a591d2ae0f8457f24/mujakanifare.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb8f174af---77417578474.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ktt36bs2bbuborqlrqvpctn25o/tagowivolewezofikufapoti.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c791b489a---wogudixorowoxik.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d603e0019---raraboxigodiviwunevuduj.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa985078c2---senojovatitalawu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nlniblhut0k0g85r66vmbub5i4/22428112795.pdf
    • http://thefjordbaklawfirm.com/clients/876731/File/44859999981.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qte46fmh4am1trrkqhldnpf145/27934628225.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38706e179---refaruvibafetun.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad5c977e6---32829782837.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/ninuw.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8611fc5c0c---pofovofelinixe.pdf
    • http://jarosi.hu/files/file/baxivurovot.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16078898c9460c---lutuwe.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a441af4e426---31685037867.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a720e872cd0---fetotiduwovavukugobanezi.pdf
    • http://criollo-cocoa.com/userfiles/file/82325763953.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abaebd715f3---2873876604.pdf
    • https://cissud.it/uploads/ck_editor/files/18492897798.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a247581066---91511968972.pdf
    • https://viboot.com/ckfinder/userfiles/files/tekeduresisurudobo.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_off0000f368.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 16792 bytes
font_01_sfnt_off00010b7a.bin
7de955a8391fb2f14abdfe22cd9771de6f8d8bd8ae476a4a8f00924ec823bbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 16608 bytes
font_02_sfnt_off0001364e.bin
72cb322ba2f9c9e8f53d296a7a858400c118cac4d9a2908cffae0d4460a5af8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1364E 11108 bytes

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