Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c066df71ce2b95…

MALICIOUS

PDF

81.3 KB Created: 2021-07-01 12:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daaaf82d4d756bb733d66094c6c554f0 SHA-1: 7426fb5859ccec1bf046307fb0cdbd8af611ac8c SHA-256: c3c066df71ce2b955a704ce069d4834d1ea1a2128618192177031a23900a8814
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. No scripts were extracted from this sample, but the presence of external links and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=pearson+physical+geography+7+answers
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160849f38b60e9---41325157470.pdf
    • http://esoftland.com/userfiles/file/6752243931.pdf
    • https://pestresolution.pt/site/upload/file/totapu.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d2c876be9ae70cf9df78185edf875439/61057898391.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606e40675b386---58164601008.pdf
    • https://avgdesign.com/userfiles/file/xisesamojutusunix.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d915b585---fozufek.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7e2d62b968a870531f8a3dd2e075cd2c/nidumuguribavofukub.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/57204faa19e0d5ac076e1f77709a1c50/romifuva.pdf
    • http://bitite.lv/media/txt/122/file/kotawepaxegonekefiriwota.pdf
    • http://nhactheducthammy.com/upload/files/pulaxawekixosefok.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/284ef7dbb75a65d34c07198441a66264/92716155331.pdf
    • http://omonetach.pl/foto/ilustracje/file/33438983618.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609648029b268---muvovisovajokabufasaz.pdf
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/76660763361.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ba46a1c643575b5935e4769e3cb4dd23/mewatetamajiwa.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f7b75e2---28258986620.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/60c290e45f2e6b31d656903c6e33dfdd/pepisavonafiwas.pdf
    • https://asiarsolutions.com/userfiles/file/69267837585.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/i29s2b1sla6r46j5hdh7rk7u2c/jalimot.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/88507729cb1b051f6b268dd098221ee6/27975474153.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/retavixatidejotamukazal.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/612b238cacf2e4eae5df7351f65e62e5/tedovusofezuf.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_off0000da7a.bin
356ebb35e6f6b7f186933977ce2ac42cb65a9880c11d4f4cb15e1ebb2124bf53
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 17004 bytes
font_01_sfnt_off000106c7.bin
bdeae9ecb71769d5f475ee7fcfd9e6476d8d3514bba0a71adfb0dbd9f22aff8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 10808 bytes
font_02_sfnt_off00011fbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 16792 bytes