Malicious PDF — malware analysis report

Static analysis result for SHA-256 f961dc3adde25044…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 02:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b9f9e6ad94a4222de070827169bbe52 SHA-1: 5385a9deb9b7f56298e558dfe47721664a526262 SHA-256: f961dc3adde2504480cb2ac73684fe8c560e3e969c29caa80d1565c98f6a2cc6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/46d6c39f8afa9ee20d2abd3d3793eb52/96266647786.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9d7313bd1e27a78ead9ee93b7a301a8b/nixebuzuvudimigaxesa.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/komixamosepum.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lobudajeperudagikotaka.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/lalugibobupuvadoladarej.pdfIn PDF document text
    • https://chptravel.ir/data/file/podupogelegorasuj.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/sirapivuruzamikuluzavop.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nsgacachec8bbrvc9c6p41lkk0/zowesepuxige.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5264262394f1a0e45e438a5cfd778c59/68534688282.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/vupoparesebexokigobi.pdfIn PDF document text
    • https://promise-land.com/upload/file/varuvuz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f678b8a374---tijil.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/vesepo.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f798293a6f---kepazaxotuxadodazu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/66552552309.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/44210362603.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/0b7hnl3kcaf8c6u18of1sf70h1/18029488530.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/lifidafomowuwixutepi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/tugetegafuvexurovibud.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/47697100907.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/dabeweneza.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/16551884132.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec695dc1f922a7c7cfb9cd2852d6aac6/55903018698.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/folarenawebazebusis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=that%27s+not+very+cash+money+of+youPDF 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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 10740 bytes
SHA-256: c4a6fc9da28620c552e268d4e94789ba1eaa047a3b52d13e170c9be55ee5f871
font_01_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 17260 bytes
SHA-256: 8ff561ef485bd09f9674bd085a3ed8149120b5919861232fa445d35652568792
font_02_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1