Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c029f6805b6855…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 16:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2233976b69b8472935d57aea5c5bec70 SHA-1: 3d48afa043be3ca2e593151fc84139948bb7c0c5 SHA-256: 98c029f6805b6855180ad761e42b831d4e6252bce7274a70f9c546c67470fdb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as a redirection mechanism to phishing pages or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161312c860eb65---gujufelakewunivimalif.pdf In PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/rufavomorirukeduwezij.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wigasotofuga.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/24682313895.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/zavijijoneza.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/86309357519.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/duposekora.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/masazagovobiwelaxi.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/41258851179.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f69969d24---bejepepelakane.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zoneleveli.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161394d4411645---puzixudugil.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/nezopotimuje.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631102163.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/73180442208.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/30044738553.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210907223741.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/2225764761.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/fibisaxebuwavaraneliseku.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355858a85a3---91971549777.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zizanuxut.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/pefagexozilapunabilijive.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b93b84a5af0309f17f107697e81279f/jimuna.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/71852823204.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/wuzenijojasakerasop.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/fepezijobunidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=offline+music+app+for+iosPDF 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_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 10668 bytes
SHA-256: 7b184e1d8df7d66a3950d9a08886b70826371ac25295dad7fbd25ba676b9d519
font_02_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 17552 bytes
SHA-256: 04075e930374338c51c177eea488bc3caed2eaea46d36e3df0e45e7fa9069de1

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