Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d4812645e209c6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 04:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a78a4c26c537219c3aece9252146434 SHA-1: 586e21f6e061e89cee182c6d41ad6ff7be3974df SHA-256: a2d4812645e209c6a5958de2a2ef165a49eaf57cd14f4109424ba3379791351a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate the document's purpose is to drive traffic to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=leyes+de+la+termodinamica+resumen+pdf PDF link annotation
    • http://altelaw.com/uploads/image/file/58387750779.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/jazabobagom.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/lijelesesakonetukodedozok.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/visatusakis.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/dd99b5695f8f8adc1e1518231b322179/ropozukijun.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c57d2dc8f---17875005619.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a66d9b87479---20908302224.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa74af23ed6---kajugudopofuxekesuvopuk.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/32315637001.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/32695007118.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/21450e1d0ab5626cee421ad2bae36a95/posojelimaxofuzivonexabax.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609049bca56bb---55833034970.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/62350946578.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ld20kgfvsdm9u5c81is8p4ru3n/86945925599.pdfIn PDF document text
    • http://fpole.ru/sadm_files/jopisetevo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b4842910fd1693ac42d38cece25d3f88/xijurowiludatupiturel.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/dekesonejoxapiw.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/68053888338.pdfIn PDF document text
    • http://darec.sk/files/files/68507448155.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210826192438.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/9ac6185eb0276a91aaa33b2bb2da8358/54520232532.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/58028558993.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff30078f098---53843623249.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ekjhdua67ofj772t742klh6qh9/26985920477.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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 19204 bytes
SHA-256: a501bcaf6275a1a8d0bba1ca98996ddeb744e81fa3c11ee5b24ff8bfe60b1ec9
font_01_sfnt_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 10952 bytes
SHA-256: 7642318f79ca0d0b104d13e177eb4d7688c4153063837344e9ad598213d1d0f7
font_02_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1