Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed52b66da352b7ad…

MALICIOUS

PDF

83.2 KB Created: 2021-08-19 19:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41c1d33c9a7a27272861aa3c3d72c991 SHA-1: 211c6ee499159f51f8c19f7e956ff3a842de8273 SHA-256: ed52b66da352b7ad29d0d8a3793ed9ee8400cfc172969c6b3887b63136ef3168
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious domains. These links are likely intended to redirect users to phishing pages or facilitate SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16107dafc37a5f---ratodadunalolafoxowada.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/tejulanatowobalefinolevod.pdf
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78707054757.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a72d618da2---pamerobudajaguponeko.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/90q7auvlvhuae2ijls650ad509/69196205623.pdf
    • https://chinese-wall.tw/upload/files/72684779804.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/22041977702.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/titinugemufujewe.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/63482540897.pdf
    • https://bravo-hk.com/userfiles/file/43938175003.pdf
    • http://asiavent.com/UserFiles/file///posekedadutiwiba.pdf
    • http://www.kickcommerce.com/userfiles/file/suwiloro.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4b22d88da---17908768676.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/54487fcd79a25426a424a19f23f583c1/sowogarus.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2836653d95---63980784959.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/fuverovuferuku.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c020a7e13---nababaza.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/41878626627.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609637c247a80---dewupiwalurojagevasotuw.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e796175e72c---55575812430.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff19b5a1f---19525990488.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ca9eaa9b---zegusisusiri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+gain+muscle+from+skinny+body
    • 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_off0000e06d.bin
634b31a2a61e2ccd2004de94a73a6b66ca53723f96f397e7ee4a8f246469b0f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 16776 bytes
font_01_sfnt_off00010bea.bin
89d8b6b3332efff7cfab9d847160a57bbdee37d80a11a38cebdbce4b85db5a99
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 11344 bytes
font_02_sfnt_off0001267a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes