Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a8c5273cd49db0…

MALICIOUS

PDF

92.7 KB Created: 2021-07-08 08:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1299ae76da3131d6eb479e2d3ccd20c7 SHA-1: 3f076cf2391fa11f29d8a9731ffdff7a74c81b56 SHA-256: e9a8c5273cd49db0162f9bd439c3b2a12543e829ecbc30d4c189350fea7aba43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to redirect users to malicious payloads or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in distributing malicious content through compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f10451ffe5f532fc9892a14c4407da52/49736724242.pdf
    • https://ncvpte.in/userfiles/file/68074988469.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec0c10ba05b03d680fc9ca4cbd398209/dajavegadojevuluniseja.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34bb61a48---73252635096.pdf
    • https://chinese-wall.tw/upload/files/ruzeligukipunevogaziled.pdf
    • http://pwmtqatar.net/userfiles/file/78032180051.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c22b5d3e37d---pepivugufotag.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bgsvt1ejii5kvij8kr9v19hooh/42841535586.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/1a9019610ab4128c5caa17f9dc332549/sobixaladidewu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e78f9314ad5b09f3da344ceacc5c99c6/14499846341.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d92d0b19e---rupuweradugaga.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4881f60668---57032605096.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e34fde85c---34115308465.pdf
    • http://udruga-invalida.hr/files/pixunurimup.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/mixukur.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9348491d46d126e7a84493d1de9bf34d/13591412451.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ekc8dra45t8bajpke76hpekjli/bupefoxufuzemebidu.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/57728133003.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d048b385c2d---37632638424.pdf
    • https://camping-du-lac-dijon.com/fichiers/25301051866.pdf
    • http://jinxinghotel.com/uploads/files/26345402179.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/707a0ea10b7c1cb75d6dd65207f02c26/riposuzapixovabo.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4089836477---87350866381.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+amount+of+matter+contained+in+an+object
    • 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_off00010476.bin
292657a39726958ef0ecbd1c9c8fc7a92be7ac3dbce07360b3f0fde7dd5ee6d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 17760 bytes
font_01_sfnt_off00013363.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13363 16792 bytes
font_02_sfnt_off00014b7a.bin
aee7992d093a08f8ab54ab8d2295763c9bbe3521f0d774af42681f3d295e735c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7A 11056 bytes