Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bc7d30aef7009b…

MALICIOUS

PDF

94.0 KB Created: 2021-08-12 00:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73f3c93828466c5be6c4e606df193ab6 SHA-1: dfe6884afe06cabdf1a46bfc817797261e367870 SHA-256: d0bc7d30aef7009b95a7f5092cfcdbed4fb5fb0d1fc2643cccf724b721f55233
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm nature suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://eitmedu.in/ckfinder/userfiles/files/jirokepek.pdf In PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/7dc236898b6548ffd51a492c1a974ed3/19991768066.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071222ec33ab---kezufawekukajarar.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/gironegazojiko.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-9/20210509060325460430.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/38616634074.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ka8f7mvclf9hvga79h3929uir7/24143001730.pdfIn PDF document text
    • https://badrivishal.com/media/60589395096.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/35870202896.pdfIn PDF document text
    • https://digireg.es/upload/8920414018.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/69255df146849039321fe735b9c235e5/sejejidaletebo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160afbcc90b8e0---leritiwurozewubofodisip.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd0864457---38137352435.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/49608069032.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/17789430570.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3f3fd223b---54906418973.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/63267173526.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceed72a3ad1---28433936303.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe0642b75---vebowamimevav.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/83683309127.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6900cfff26f98760c3dafef9bf0673cf/gofizuvejazedamamob.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/867a7877e0398e0d8751679098c1b4fa/binodu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c863ee9556---sedoxezig.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/nutaziwerumug.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9fa3de138a73c5510aba59bc408ca0f8/31048743810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=zodiac+signs+characteristics+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 17152 bytes
SHA-256: 3682000a06dd01ae9c01b1b0ba3bc30a7050fb12e7e4a6aa19d269ccddcbcd5b
font_01_sfnt_off00013750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 10816 bytes
SHA-256: 936eb7c81a4fe9d49e908e70be8a1d5cc1fcfc9371d4f33d4c4daea195d102d3