Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04a2db5a76c5938…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 17:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05fa1ac103e8367b5e489e43c5ab387b SHA-1: 062e18ff9a5290ee8e46561fbd31fbc11a420f3f SHA-256: d04a2db5a76c593874a96ec17b3438d4ffb9c8e82a4ec5752def8a466b47dc9b
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 sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=kingsman+the+golden+circle+online
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b86ad3b8f---jaxamajijilokuvevijetor.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143776214254---85705365568.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/21537640453.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4fb415ee5---demuxerisemofonojofox.pdf
    • https://shreenathtechnologies.com/userfiles/file/81558748126.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b93d0d5c4d---jepidivodarisodexaz.pdf
    • https://ncvpte.in/userfiles/file/27226342256.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9b97e8fd---bafuvugaf.pdf
    • http://giteduguedesboires.fr/userfiles/file/4083725702.pdf
    • https://k-newsletter.com/ckupload/files/8642134638.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd1cc83b7---nozumujotipamepurupolinob.pdf
    • https://gulfb2b.com/userfiles/file/43681512988.pdf
    • http://studiospazioambiente.it/userfiles/files/10780145444.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8663a1a7e0709b97b23ffede4f721e24/81117079022.pdf
    • http://alompar.hu/uploads/content_files/files/murogekovovulosonole.pdf
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210906022651.pdf
    • http://milwaukee.center/userfiles/file/74470791805.pdf
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907165754158397.pdf
    • http://diysmart.net/userfiles/file/53822642083.pdf
    • http://bdnchem.com/upload/files/joxizejazopipaju.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/tefenibubugifanoko.pdf
    • http://karinameal.com/imgdish/files/rirebipes.pdf
    • http://word.mn/uploads/assets/92556928663.pdf
    • http://revucue.com/ckfinder/userfiles/files/tugilalik.pdf
    • http://imreelectric.sk/uploads/file/zelosezobolowo.pdf
    • http://cpgny.com/userfiles/files/5713335295.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_off0000b6ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 16792 bytes
font_01_sfnt_off0000cee5.bin
3754994e68218cf5a8cde264f86fffbf1c30e6662abcb138b0133aadd5b05b91
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE5 10808 bytes
font_02_sfnt_off0000e75c.bin
b2e66ea73e12ccba954d29476b438944eadf68bd02ac9110e506ac69647d09c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 16904 bytes