Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c766dfb87482092…

MALICIOUS

PDF

127.1 KB Created: 2021-06-30 03:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2e747ceda30d494064a6b2fba3792fa SHA-1: 1844f889b64c89820d00b0126f419982624067d8 SHA-256: 0c766dfb87482092b6d2d30c3546a186b74b1955bcddc1d70896316b578dac5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=gta+5+pc+and+ps4+play+together
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160849136f13d7---9862546914.pdf
    • https://pmeds.us/userfiles/file/50535736389.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/17394116329.pdf
    • https://noticky.net/akce/fotky/file/67136919641.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c01cd75db31---kanug.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/db1135dfe536d250ecc1a34acfdd7fbe/vagetumemanisogubeves.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387a16c242---22639296649.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c76d8e4cc55---45325645625.pdf
    • http://debschoen.com/userfiles/file/11482813303.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76bc71ece---bupafajezakun.pdf
    • http://shinies.ru/img/lib/file/neridarawumodenixiba.pdf
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/nubejugexis.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b26b71ac0---mubavu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a811d748c34---fagokumoki.pdf
    • https://efnnma.org/files/file/bovanirobagigebumidituze.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/wiputufapi.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6786276d---timawal.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9195a041e---34766199675.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd57971e4a---42852702520.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/04b9a7d4794aa752faa3f164fa1ba9af/kuravometonokivuladonob.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc0f760d6---82509771390.pdf
    • https://brahmagnanam.org/fck_uploads/file/jireragipurujuvi.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/jugujoli.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdc76c1e3---72694851673.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/20489d56b8102d997d63552add9672ca/sonojisuziweximabepigut.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_off00018f70.bin
05dc769776ccccd1f50b6bd38f528aca3a6e2b832f85a44b84ca222148f78d60
pdf-font-stream PDF embedded font (sfnt) at offset 0x18F70 17492 bytes
font_01_sfnt_off0001bd1e.bin
2d904367b37cb1383bb8e9e83f79a78596732486f9ba474863ce0b156203b52d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD1E 11064 bytes
font_02_sfnt_off0001d6d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6D9 16792 bytes