Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c254f74e53414d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 01:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 122b868355166a7524ea1a5447d820fb SHA-1: c7afd7c8b5f27b572dcf2a3f0cd50ec75f2d63ce SHA-256: b4c254f74e53414d3fb0916d1ca24050f4f1c48162a80dbae09764cdef157137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as http://alnoorcity.com/userfiles/file/wubatodivewolozox.pdf. The embedded URLs, like https://nomylo.ru/uplcv?utm_term=movieflix+bollywood+hd, suggest a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=movieflix+bollywood+hd
    • http://alnoorcity.com/userfiles/file/wubatodivewolozox.pdf
    • http://nissanotogovap.com/uploads/images/files/54140660394.pdf
    • http://vikingpaint.com/user_file/file/lizogogifegasevinigine.pdf
    • http://dongzzang.com/userfiles/file///33695910320.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa07a89892---34181132849.pdf
    • https://pensionradvanice.cz/res/file/zosugigelukuxuw.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613785419d166---63092648024.pdf
    • http://mastrodibaglio.it/userfiles/files/xogapamigosujuduro.pdf
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/fomibokesisoxowejerew.pdf
    • http://azstorestudio.com/uploads/files/medikuzikenanuzef.pdf
    • https://pinkrali.com/calisma2/files/uploads/43294338628.pdf
    • https://hunglivet.com/uploads/files/202109150437559273.pdf
    • http://altiro.nl/home/tjerk/file/63467103449.pdf
    • https://zbmbudomont.pl/userfiles/file/gomobogivagegezeze.pdf
    • http://contactfm.be/userfiles/files/bedimireb.pdf
    • http://makesomenoise.hu/upload/file/20379119801.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/4043607510.pdf
    • http://iberia-ex.com/images/blog/file/ruputuwa.pdf
    • http://morecoredesign.com/images/imageUps/files/62972596360.pdf
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/88479844807.pdf
    • http://simp-q.ru/userfiles/file/77447371964.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/56360303373.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ae7b26a039f44df867676bb07ff1c443/61749800784.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161309499179ec---nelekibakifapilobowop.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_off0000c602.bin
be157b40f4016e4712e1f93627e24d2c0d0dd5da32f3aa75f06babe790952bdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 20228 bytes
font_01_sfnt_off0000fb0a.bin
f3e4b06f33139d75e2e5a2587f0b6b10c1b0ba521aa657d5238384d3b2be5312
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 10320 bytes
font_02_sfnt_off00011274.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 16792 bytes