Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f174943d921990…

MALICIOUS

PDF

86.0 KB Created: 2021-07-14 08:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0cf90b8ac65b0a4033555ea0ee9c2a38 SHA-1: f26409f03910e93c82c76b3058b2d0541d55b2e7 SHA-256: 50f174943d92199078dd89b44009f286f9b97445b9e116a94f8585e337f4430c
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine rankings or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 5

  • 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://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d365c6c16d3---87609298893.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bh2j4m254asvid3prnmnqhfksb/jaredibagixapimatovax.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/nukezaruteduledaz.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/buwumakexiwemasufo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d6007ce8f00498b02f693e197e6c82e1/fusagufomamazazanuf.pdfIn PDF document text
    • http://abnicum.ru/files/file/56080182477.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/64767102231.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lps742d4pp2dnkkj9oosr35ch1/60670610744.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/97588653813.pdfIn PDF document text
    • https://purefeeling8.com/data/file/66210445043.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wozowapipilawa.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd501e9f8---kelisul.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/jalobuwewomufarogezixexag.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/towolewetomoliromifuna.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/45363275660.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0c425cc00ea1cca0a1c78495fd4e4018/47522625591.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/33460414813.pdfIn PDF document text
    • https://songhong.info/userfiles/file/7016741986.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ca83dc0e---65787330504.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1bcb6ea765f8d0e5c06518b48a204568/76665442935.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a1a7ac7e---89231671935.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160743e67005a1---fakamus.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/31855677757.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96bfb9e2d---pizafemowelav.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/59956039277.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/vuvatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+outdoorsman%27s+atticPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 10684 bytes
SHA-256: 719507bb0d1a2e91efd7c703844e4c3151580f980d5c332924b078ec901479a6
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 17212 bytes
SHA-256: 938a539b5d380846b1ce82fcf2b2d0bf030c9106739ae271a3aeb6b19176933d
font_02_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1