Malicious PDF — malware analysis report

Static analysis result for SHA-256 92742dd91e233557…

MALICIOUS

PDF

76.8 KB Created: 2021-09-10 13:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b91db13af61724a47e3304741314b50b SHA-1: 6f827771381e10032d42f453e22d65340841ffb7 SHA-256: 92742dd91e233557d78a4f552d8f86f621f525aefda76bf06b5f122a172f971b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://organicfertilizerproduction.com/d/files/zesalotiremolopezuzused.pdf In PDF document text
    • https://bahispesinde.com/gnc/veri/_files/poveferikurorem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e65eb92ea---20203243092.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/zepepedasavawusobut.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pakonojakeror.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fodasoxomipuduburil.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161397dccd798c---nidakodu.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/48150922413.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/34350280945.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/99424581709.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/77231532469.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/50725949764.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/pidopebupo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/49343443319.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/99462821890.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/matixe.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ke2ctpu2gin0ns404ctoqdsqv2/15754963535.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/31133741373.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/xujaxawamelifivajinuzovu.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/besebe.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/27595989266.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/ruzasisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fo4m+thailand+apkPDF 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_off0000c1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A6 10404 bytes
SHA-256: 4664e3682237edfcd1ed58d8bde676492ed57d7b58f09adab50b5236977a7129
font_01_sfnt_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 19500 bytes
SHA-256: 13adacf8aafd276d6bb0a8066ffb3ec351d1abca0b3af1b8248f47995551b33f
font_02_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1