Malicious PDF — malware analysis report

Static analysis result for SHA-256 6900ee33998b5670…

MALICIOUS

PDF

89.2 KB Created: 2021-07-18 12:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8da515f321604291f8388d54c6c0f533 SHA-1: ddc6b271baffcdddf0ce7934b30e212dda394ce9 SHA-256: 6900ee33998b56700960630a29f9f0c219ffd9c356ade616df965b2f8ced874e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. The presence of multiple distinct hosts and the use of disposable hosting suggest an attempt to obscure the ultimate malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5bcdb2be---8124359389.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d45c570ec407cfbb2f0c185c217605e2/35752709829.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f31705bee11---mefedusutefo.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2794138185.pdf
    • http://yilip.net/userData/board/file/21433634443.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ouvv11g5ajel5a0nehf3svi7d0/paboxinaz.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/385245c0e0cbb534d1133dfe704cc732/tivefuvisavojosuveseroz.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5c0d0f0a---rikarejewetanemafozu.pdf
    • http://aldo-ins.com/userfiles/file/11361531286.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3ggt6i2m28i4lmp48hu4j6q21f/22264658412.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/25787455727.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a59b1bb710a0c1a5fc90a472d5030cf/51375939967.pdf
    • http://chemonova.com/FCKeditor/file/84520343365.pdf
    • http://wisdomtours.net/upload/file/47151377388.pdf
    • https://rarahil.org.np/ckfinder/userfiles/files/47821748995.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b0170960a---1818207419.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ciaj2n5ft5qpv9q4r4agt8b971/92180015369.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a4fda27b---pibosuwafojetuzozo.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/eqko57h0m2ndfn5ktfgjjfuhdf/lazat.pdf
    • http://runo34.ru/attachments/file/69815129046.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/a2a0890496391057404d23bfb249334f/dusisadegekoxefuraxererok.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/1a0e6820b2e78841dfe5926db265f03f/tilerepiwatufa.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160871a3d2e11c---gizuvizim.pdf
    • https://martensmgt.com/business_school/uploads/file/37977589426.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/orilu901qv7ngdo8mh13ds9m2s/vunenusezofimanawivip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=positive+opk+before+period
    • 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_off0000f939.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 16792 bytes
font_01_sfnt_off00011150.bin
f06187da91c18d7b7a7a1a321104299374fa9719cb02a7e0a99859826d77513d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 10476 bytes
font_02_sfnt_off00012915.bin
efcc874b757e1cd9a5d445bf9274385f7fe834d34e4616441ab05150a85ea501
pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 17080 bytes