Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4728ed1b53168e…

MALICIOUS

PDF

86.1 KB Created: 2021-07-04 04:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e82e7e028bf60f0273ba4706cc4d94c9 SHA-1: e87e6272ea55c5c2952431e5784b1c8951bf16b6 SHA-256: aa4728ed1b53168e3fc45ee434685253afda9c2fb26b82d00ddd6bc32d5db648
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://ketchas.ru/uplcv?utm_term=division+rule+of+8
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4lp2dq09aa5djftl6k0qvq5ahr/powekafofubiza.pdf
    • http://files.ibiza-ferien.de/file/xokajifelusogatenidawulo.pdf
    • https://mangmalungtea.com/userfiles/file/firaxasemiwa.pdf
    • http://michellesmithscott.com/clients/36670/File/jonaxizosu.pdf
    • http://jfac.kr/ckfinder/userfiles/files/pevufi.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3c036e68---86094344172.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf5f1b1d4e---72739672572.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4e400a276ae89a87021d46bff0bdc5f0/76664999134.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b6cd0eb11---76062022689.pdf
    • https://zemiigori.com/uploads/file/tojadiwud.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/49903bf477118cbf586e04ee86a86979/58344892676.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0787619680---divuwekosagok.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/c2d43f7cc9e052aa8b9a789df1e45e3c/72720233744.pdf
    • http://commune-bourre.com/userfiles/file/jizofum.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9m8ni29o40hbvaatu4nnkaf3c3/75415233913.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/fm83sb2mcipdipc10mcvk4o42s/85933695368.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b276650248d---fugovef.pdf
    • http://stalmont.eu/userfiles/file/domosopi.pdf
    • http://ttc-investco.com/img/files/17164294403.pdf
    • http://effektfilm.de/files/file/folanabefuzaji.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de5ea09c6---89058381004.pdf
    • http://etcad.net/np/upfile/file/bovisagatikinogos.pdf
    • https://global-brand.net/userfiles/files/46256237880.pdf
    • http://gshosnab.ru/userfiles/file/32304458233.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rf46nh1a2u3i05gvfnsc9867mo/68961097751.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc3f39318---pafibavozam.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_off0000ed43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 16792 bytes
font_01_sfnt_off00010555.bin
b04405fd98b914a8478c0851dfeb7ac6ddfb866aa0b93682ed9257857618500e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 17120 bytes
font_02_sfnt_off0001321b.bin
974bdbfcbb13539dc64595f7ab87de4128b04882d3ebaaa5f93f61360c618661
pdf-font-stream PDF embedded font (sfnt) at offset 0x1321B 10324 bytes