Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb818467e268faa…

MALICIOUS

PDF

92.1 KB Created: 2021-06-27 22:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 910d044493abc1eafc2ff03876001769 SHA-1: 0f83e842c3695fc6d07fbda07413aa17f0ed3d83 SHA-256: fdb818467e268faa5e161dd43d758ea87d100d7fbe7703667285ddd94cf2fdfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'link farm' heuristic and the ML classifier's high confidence score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=herpes+but+never+had+an+outbreak
    • http://petraifevronii.ru/ckfinder/userfiles/files/winogonabugebatilib.pdf
    • https://gites-les-bardots.com/userfiles/file/11096234222.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087e7bca9424---dowutimefokuwofexegim.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d28d13bf2d90ca19503f3df4f16aa876/ridosejelikem.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ee21748a6fb6dbea1b9fbd8c76a82a06/83512003079.pdf
    • http://atol-res.pl/uploads/file/94273921936.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609de3cd1aa41---xatisobamufavefanigere.pdf
    • http://aeronautike.com/userfiles/file/gisudunemavenoza.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52e2f66bbc---luvavokamupefatuvo.pdf
    • https://bakwanudang.com/contents//files/rufafesebed.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b205f738ccf---forefitof.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7f878b42b6ad8e2ae9f8e4ddaa2a9f61/ravuvowubaxeposu.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/th0rt7sn14oli0aci1t5lkkdka/sitirupodorexemuribi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8d049a4c---sesozokogoz.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b447f02e0f---84261550180.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/8697872074.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb591c39d4a---97276376265.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed08dcace1---30216050619.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608212375b20f---jirelite.pdf
    • http://tubietelbar.hu/uploadfile/ridaraw.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/192a46e1001407838c9b0816c2839619/78475442336.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bg3ba7tqgo5etln2d0u7v2vd5a/20765842448.pdf
    • http://kangs78.com/clients/66216/File/jelepiw.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/53765957836.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fb0c6bafd0cce3639fe4b5ca773b9b7a/16132746448.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/muzizizubolubi.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_off0001047c.bin
cc3248552d632cdc15aaec09311cd1280cfb3f4b5710b7b53765323cf4a2b736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 17536 bytes
font_01_sfnt_off0001326e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 16792 bytes
font_02_sfnt_off00014a85.bin
7b43e797318235515aa610b4a9d8899c6d982754a98feff3622be33efb0c9a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A85 10740 bytes

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