Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9a92f083346772…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 14:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0861e85c0cf4554ba1894fe316be61b SHA-1: 985016efb341a37eecfad45e86e8b6f7487149bc SHA-256: 5c9a92f083346772ef3ccc5fc8c5bed87f9b55b0b07e6ea3eed1923e90260d73
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous URLs, including one hosted on a compromised WordPress upload directory. The document body is unreadable, suggesting it primarily serves as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://barcelonacentromedico.es/files/galeria/files/81718790025.pdf In PDF document text
    • http://imobiliariaimperio.com/files/files/60959823122.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/xesoguduvalaxexijobus.pdfIn PDF document text
    • http://kme-kme.cz/files/file/21034137278.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77707545979.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210912_CA7AA649E24D0219.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/72510022427.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff3e103e7---dawawawaxekopavevaleloxib.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf1ddd57e---bigumapedejevafipe.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-8/20210908163029368429.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/34267706830.pdfIn PDF document text
    • http://goldmustang.com/files/files/pamekonewufedunisovi.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/93080533936.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/36177948674.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/lojuxutuxese.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/2353287068.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/35567770642.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/7755055588.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c282622663---57370639407.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/sederuva.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8b05fb8e1c3f8e93010d4ca437dbebd5/defobakilizexerukof.pdfIn PDF document text
    • http://web5gstore.com/Files/files/77942313205.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/pitokekosev.pdfIn PDF document text
    • http://potya.com/waxiraloziwetopuzibasa.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/96328787862.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/kaxirirope.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84bce065c---30793418639.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/89517649949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=visible+light+is+electromagnetic+radiation+with+wavelength+betweenPDF 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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 17816 bytes
SHA-256: 4bbb7279fe2757204e2165efe470f033cbba04ca9e9d13e449305aaa06befaff
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 11080 bytes
SHA-256: cfbb06ec5b0de9b9e905ed79c861f9bea1e5dd293a166be67e651d72d7fdada5
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.