Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a9e9b428a72268…

MALICIOUS

PDF

96.2 KB Created: 2021-07-22 19:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: def2aae3c25e9d083ae5dc11a4b3eb50 SHA-1: 1c8dfff2055c0c61c09cc4e362b9bfe05384e51f SHA-256: 68a9e9b428a72268595736209f7c714d2731b9e671f856c0d4fcf2fc04966e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and URL distribution align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://shopinhome.com/ci/userfiles/files/dotenonimowaxoxaxetanar.pdf In PDF document text
    • https://pellevah.com/upload/files/56182276445.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d95d8aa76a92ba655d28c291ab2a1921/nixopomigagukab.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/97341616016.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/6c91272c6a6da5da9fb23424b88d38f4/paxawetezorib.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/71707550534.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a0aca7fc6---86604057084.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160711230dea0f---nipudewonewiwilixofanute.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a2049d8fe8bbbb317474a99b05a1a7d3/41068318590.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/besufatadazitejotovedo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c0670818c81d918925b6e7511f16d41b/48815993978.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wixuriv.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/gffjkjtqjnis92ind643bgebjc/lajani.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cbae15fe063e6637434f1b3d6868f0eb/migixesevelop.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1635128055a51abbd5f5b87a6fab2c20/pixoxidanumuroxodigeza.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/lu85392p2pbp8usund7tconnp0/wozijuwagutepuvin.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/81914114309.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/96705156157.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5cea87f8b---15851897804.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/81678291198.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mobp2bthc7vhmoni1vhka2oit6/24985273629.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/junasibalezitizasujosabeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=recommended+calorie+intakePDF 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_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 17308 bytes
SHA-256: bf05374eb78386fb155e2be362fe29b328598188442f9548bbea261b5c2169c8
font_01_sfnt_off00014292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA9 10500 bytes
SHA-256: 61df750a55233add8c3425fdfa195ca136cb26f2c0e4d3cc6fa5c76c64363a49

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