Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ef0f4c45ce6de0…

MALICIOUS

PDF

84.8 KB Created: 2021-07-22 13:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 168344851b185ff974e696bc792c40a4 SHA-1: 334ac1c699dd2de71e1bb4338cfc89ec0647a688 SHA-256: 41ef0f4c45ce6de078ce71ec7b3473a0db73bb0a83a533f52034448eda708267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/89bc459b936908d5e0eb9d5623f0fe40/39641788706.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/3e9c73a2bff5f2b2bf4b70f3181b9e78/tubesiwozudegej.pdfIn PDF document text
    • https://mollis.rs//files/revaduzafusuxubilugazes.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/504912eaada63544f7fefd39d7e12ad3/33837941501.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/11257135364.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/bujuweronogat.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091824c1f9f6---48779413030.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a9775da.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a930df5d237a1a2666c2266d59586e2f/lisoxogapugufagifidovasu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/405558f747225a425da79faafe55d3b1/guvatemenup.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/tasozeka.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/sezekilipezivar.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0530f26e13cbcabe1fccc3d806840d08/67241961902.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/puxodusene.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/af8372143074f98750be6fda98e507c7/48863643064.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/78716633990.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3ae82e75---mozoganumipijajeweken.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/89009547787.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2989cb5180---kilaxanobifizagiwoni.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/m9k8dka2rn62gmvnaf4o1b23ge/ziwewawiravalirevamos.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/26431153816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=stack+up+meaningPDF 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_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 10552 bytes
SHA-256: 388a0c87ed99292df2da43b9bc2242f103c69dccb0a4dbc92047321714f2c6e5
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 17968 bytes
SHA-256: 67663ffdcf68178c2b7c643216115b07cf48aef8225b238dff841e8aa7174aee

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