Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78ffdf18293c6f2…

MALICIOUS

PDF

80.3 KB Created: 2021-08-17 22:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ee4ba1dfbb34f93984bd147705ce228 SHA-1: 2fe1138eb45e7274ae5b28e6d8323807fc76ffb4 SHA-256: c78ffdf18293c6f2b4a2d271cf70cd34dd157156970486bbd8f95d4dc7996c95
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 pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e8f8c1505c90e10dceeee4ad16a8cae5/57619752276.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/d7ac283f1eee58dc4352c23855d3776c/97424540979.pdf
    • http://stromzeleny.cz/file/32999864294.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/71e88b52dc4c09955ebcff044d479281/muxuboraxipipopaga.pdf
    • http://begemot-rus.com/uploadfiles/file/2021062608541973499.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/113e5e4b17862741ae79d2d119ad29f2/57947219129.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6ba0b814f264671fa8951eae76991288/42425530704.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/ninusufurawi.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vbrutdvpjhl3qhf0d30lv8rdv2/gifatuxelizusawikopavesuv.pdf
    • https://flomogroup.com/upload/files/wewikokako.pdf
    • http://hnc2.com/userfiles/file/gutixonif.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f43b51b6c03db2158b853b72c1b4682d/bejunirofunopijuvasupi.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72f5e16a56---wipureledusubokuten.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/03ce3acf7a3b619945f747466615094c/kevowikopuwixupomisowis.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160945819d6c2d---pevememosale.pdf
    • http://cuboni.com/uploadfile/hong202107281716024674.pdf
    • http://galettedesrois.hu/userfiles/file/22649816356.pdf
    • http://www.biotanika.pl/upload/file/xanabajoletagorezifesasa.pdf
    • http://navrattan.co/userfiles/file/rupibevusesu.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/89740a793489031f5b8d752d230b1f71/49858405949.pdf
    • https://foundryindia.org/userfiles/file/50878011269.pdf
    • http://web68s.com/upload/files/limibivulimorug.pdf
    • http://euro-ex.net/images/blog//file/lujupabewotulosuzu.pdf
    • http://riviera.az/userfiles/file/81290955744.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=okyanus+yay%C4%B1nlar%C4%B1+8.s%C4%B1n%C4%B1f+matematik+pdf+indir
    • 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_off0000cf83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 16792 bytes
font_01_sfnt_off0000e79a.bin
fa8d347b04ff7966a76e329b67ff1fa6e8f27d4278691691228755bcb98e05d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 11188 bytes
font_02_sfnt_off000101cf.bin
266df994bcb0c7dcce36717793a40e19ad1872468761649b8b483c65460b26af
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 19112 bytes