Malicious PDF — malware analysis report

Static analysis result for SHA-256 58005c3dead92bbd…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 20:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 369f8e6afbc12c79855957ea90d3b2bf SHA-1: 637af33169b54380cffb979d9c9036a3b8e57190 SHA-256: 58005c3dead92bbd4424e6aced4b96e8a59f8bf4517734663426032ae826e351
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 numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or manipulate search engine results. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs and a link farm heuristic further supports this. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2568271186---92867818497.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/77rjeij8huvpjuu0mep9t1co15/64401773193.pdfIn PDF document text
    • http://traviet36.com/upload/files/puzox.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/79044068631.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/65247422664.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e4335d8c0478bfb042d0f4da6016c55b/49757959036.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021071304302280554.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/ruver.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/mjtl00gsohepql5vgdg91tekcm/26003411670.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c3b1adc4---fafavakepiwomuni.pdfIn PDF document text
    • http://heureka-cz.eu/files/73780067872.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/vazevinutuzoxabakokuj.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/33562879022.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/84656736644.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/62499675730.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/fizizikubuvarodipo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ju6mh535tfj4t9277uo7tpro4o/bedabomabizolilefixu.pdfIn PDF document text
    • http://cascad-trans.ru/files/rudis.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1d1ktguv8df7qqgo8e0hulfp36/58893619025.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/97829331902.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/nawogume.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a905db58---vujuwepawowefovixa.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/kevuvufepeviparetuzosovib.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/15ba3b43868ec67eb37a27b1192c2056/24260456877.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160940e7f015bf---22119461037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=orthodontic+retainers+and+removable+appliances+pdfPDF 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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 17212 bytes
SHA-256: ac32804ab9e79ea063bd4610d0ff4dfa4be267b37686bf2ece2edfe7b8b87ad6
font_02_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 11116 bytes
SHA-256: 624b7e069ddb63a0e95c703573bfb83279eb642feee3f38f2affc456e99a3e54