Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81f87d375603157…

MALICIOUS

PDF

71.9 KB Created: 2021-09-22 17:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9438992fabd4a301644d2ca443660ee3 SHA-1: e9eb8164287cbafd94b0acc075405d6f36155f23 SHA-256: e81f87d3756031578d9be0218edc6d941d41e6898423b9c96b74e5c9d9ebf139
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://ketchas.ru/uplcv?utm_term=cardview+in+constraintlayout PDF link annotation
    • http://ghettaetamionarchitetti.it/userfiles/files/12107712052.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402fc3e5c84---wanowekotenisanugud.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16142d3e6c6c2a---lakirare.pdfIn PDF document text
    • http://autovoda.ru/upload/files/48482022766.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/97467256854.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac8b6ba25---gazajedovad.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/xewusuk.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/fipafujetatavov.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/tijog.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/kexinatikegibegolixomi.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/josozazefubimikabajakeja.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/bejeranunujupitemata.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/138620840261485d33dff71.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/wepozozukara.pdfIn PDF document text
    • https://trexanh.net/upload/files/82613098493.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/vuruwonodemi.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/61256733736.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/fodosefubetoti.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/vopin.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/vukisikutotuvadiverasumo.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/jupunuduxeloka.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sakamogeparorawozawilubuk.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/pakuromoganelajuzadem.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/16208129955.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/5387185462.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/32735013243.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/gewum.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/nebunovup.pdfIn PDF document text
    • 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_off0000b567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB567 10760 bytes
SHA-256: 2b7b9a8002a1df3f9292ee31da438f360d0687b0890c400894f43f2604fdfc04
font_01_sfnt_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 16536 bytes
SHA-256: 5532fe6c42946088df4029dd0da30196ab08527f556bf54478204084fb5bedd2
font_02_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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