Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b3264597ea4f0f…

MALICIOUS

PDF

84.0 KB Created: 2021-08-17 03:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca675ef0b24fbcc8f2ddbbaa5beec136 SHA-1: 65b6b3c70ac2a7e7775bbbab3f59455399a8d5cd SHA-256: 43b3264597ea4f0fdd37d89897b10e8ef0d89665e10cffc29b491de8e89c2a4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://agiusfuneraldirectors.com/files/file/77975740299.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160799c940fc2c---25854944407.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/67358044611.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/39889556306.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2ef28358a68bdf5a66d09c01f3d0b169/padabe.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5607cdde6---53724615694.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/49098753781.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/43ee9e3f6b052e48968e69e58871e232/tigokukurodevesalobobibek.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/lobuzaji.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89a245f6d0---malazejewo.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/84724348519.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/13632682211.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/nasaseninaxibodetot.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c3f82bd7a---sosimezib.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/12354525749.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/nupoboke.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0585d3e15d5aa5aabf9851866621ae5a/69090909595.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/93812116845.pdfIn PDF document text
    • http://splogservice.ru/content/file/nawetotuvut.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/silusogofetezuxa.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/jinak.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/rusiwadaxerani.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/476cdc4567565a3fc3ec252f001892d0/29172708672.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/lugebalaxorepapukefiwusa.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/64180812460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+download+music+from+spotify+onto+your+computerPDF 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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 11112 bytes
SHA-256: 245b12a3df4d1c454d37c5d8247d0d4478fc457aad1f13e1144e82b5fcbf2cbc
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 17408 bytes
SHA-256: 0d0c14798e5e30c879a3bed84aa1966dee6678808014d6b4dd4065c44720dce7
font_02_sfnt_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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