Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d271d30bca9961…

MALICIOUS

PDF

90.2 KB Created: 2021-09-06 18:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78025abb601bc802322e7c9e1418dd96 SHA-1: 24e99f1a72d2eff3fdc92959e2b1287f6a117b89 SHA-256: d3d271d30bca9961989f22b28f280ad27553a3ba4217646e8a0c40859cfe60db
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to leverage these for malicious redirects or hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kaktutzhit.by/uploads/files/pixukegasituvaxiridu.pdf
    • https://soechi.id/userfiles/file/kegadevixupebe.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/upv8jat98tsf94v1kc5qvfugpk/pajurunigatonepodoro.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013b14f887---12055783674.pdf
    • http://pololanna.com/user_img/files/80148470259.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885fc9d4dbd---rigediwidinibu.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072177e23597---40033780886.pdf
    • http://bvsaigonbinhduong.com/uploads/files/36526847216.pdf
    • http://topoint.cc/userfiles/fckFile/20210624044322.pdf
    • http://elfuklid.cz/foto/Image/file/luwerabibofejejibu.pdf
    • http://caydinhlang.net/userfiles/image/file/topamutejabufogijepuratok.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607547c22d1f9---jotumadilepiveforogosipu.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3c17028a5ed22a519734a8c6cb738dc0/pelado.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160babf2f6a0bd---jufirajiwojuzamenube.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3231e41cdc---lidatenatizenuvisewiwos.pdf
    • https://moveo-sport.pl/userfiles/file/22134155827.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f8rfqccs13i92ogolsb6usljsi/59872956887.pdf
    • http://anjilh.com/uploadfile/file///2021042919060032.pdf
    • http://prabashproperties.com/ckfinder/userfiles/files/17898688037.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95697586845.pdf
    • http://quangcaosms.org/media/ftp/file/newogagawodizanuxiset.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d6a9beb25---10418017558.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/62641618024.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=biografia+de+dom+helder+camara+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_off0000f24b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16792 bytes
font_01_sfnt_off00010a62.bin
fcf2a085bcb5973a68c8f815e59489f2640f35fdbf9b62ef5464b212ce382762
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 10752 bytes
font_02_sfnt_off000122dd.bin
b3c165598cb67d0537eaa215babd6b67c849bf71433e1cada15f4d5616e6adbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 21664 bytes