Malicious PDF — malware analysis report

Static analysis result for SHA-256 4716717b2b302dd4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 17:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5022f01a3c36d05b2b0f1c628f3ebcb3 SHA-1: 6af23decfde015a0282aee09fd12466bca75f1de SHA-256: 4716717b2b302dd4ec766794941096e32f6b514f16072a5519dcd8715320ea77
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://oishisushigd.com/uploads/files/44676828053.pdf In PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29cdae9b702ceb5293294f8e870bba6/68125515773.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/92333180692.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/telekaguwamofudifedut.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/pidulagowadewufuver.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613671c66c0fb---88150543588.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/gokulewuromakenu.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/15730959627.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/rewejinit.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/gofuk.pdfIn PDF document text
    • http://generaldistco.com/images/file/21598542895.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/4998697828.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/ledupiramosuturezuv.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/48985842874.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/67776622222.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///danoruvo.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/jevedumoxozu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/76864568bcc163f37e41ad2ab50e9f2a/25032068874.pdfIn PDF document text
    • https://olterus.net/contents/files/99434008196.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613081a4cdc9e---10006878438.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/56153528024.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/13805181205.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/subamufobodifoxegu.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wosidobigofa.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/15908380013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+color+orange+and+red+makePDF 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_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 17716 bytes
SHA-256: 427a4c81b47653a6a520bc468d7cfbf1e36c96ef9f838970ae02f235b8826510
font_01_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 10644 bytes
SHA-256: 156369b1a47c84a8112de5dcf1c6129621f486addacb09bf276356798846c689
font_02_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.