Malicious PDF — malware analysis report

Static analysis result for SHA-256 5647f15a18b620fa…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 16:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e030157cac738e325a0ece4ad6af0423 SHA-1: c97cfb6b9ad6973f3fec4ea9b9714e2cc2ed812a SHA-256: 5647f15a18b620fa17098239c411ccc7b56d621f3eb733c7096474519242bf5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=dyson+pure+hot+%2B+cool+link+operating+manual PDF link annotation
    • http://vinhhangvien.com/upload/files/67998148986.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/sulukokavuk.pdfIn PDF document text
    • https://landi-bg.com/images/file/tegukilap.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/pojumesududo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ab8ba1e1---bojutana.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/30111527772.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713e7278d9---jidegulo.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/51c113fe229e3ee0f07db70d091b39d1/jewixonafo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c28eac28d7f---2302262209.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/dozalumujizifazisol.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/nonugepudu.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/mijaxadagivulaluva.pdfIn PDF document text
    • https://successalpha.team/upload/files/47441609925.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609178142072d---27086736673.pdfIn PDF document text
    • https://33mobility.net/uploads/files/wuligadovanuduvimamovob.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/dewalenejegukiw.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804b5b8e1ae---20468457996.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/redusiruruxiwix.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/temivuzeka.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa9f58f439---42452306509.pdfIn PDF document text
    • https://073741256.com/uploads/files/202108130925367401.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b82c3bfe---sigimidawamunasariba.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/goforu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d993f80---93628588412.pdfIn PDF document text
    • 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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 11128 bytes
SHA-256: fd9af4dde62a01656cc6eca57cf2e9f4a30c39b32b1c36f5296b77b2196775fc
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 19596 bytes
SHA-256: a2404b4b6ffc21cad62f96e4ced68047c1dd9689ebc0b91b2102488ac8191e3e
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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