Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe9a2e4b0857b42…

MALICIOUS

PDF

74.4 KB Created: 2021-09-21 13:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c206f8086a2fff73b72c3b7aaf31dc65 SHA-1: 9b479b216e0b196a1f31392b7edcb4f83dbe70de SHA-256: 0fe9a2e4b0857b42da183066fff30a156454b52ba062da9a289edac7aada5d5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. Some of these links point to compromised CMS uploads, increasing the risk of further infection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=pokemon+rom+deutsch+gba PDF link annotation
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/75322990253.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/16045505909.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/jipovodunoke.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614161a455d3e---26239900888.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/59082570238.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614468ed8069d---81034934074.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161332e8873747---pugofasafopolebaputikofur.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614566767110b---xipozananizuz.pdfIn PDF document text
    • https://atlantidegattico.it/file/20786540648.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/gefizofogarasafad.pdfIn PDF document text
    • http://retailcop.ca/files/vunawiseledefifedax.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/kogugusomesagebajezibasu.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/tanimaleterule.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/mujaxek.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-19/20210919191250815274.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/51503199231.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/85162993944.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/55186359906.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/90674378280.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72b92c75a---51536460661.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_off0000be79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 17240 bytes
SHA-256: d80a777251b98574093f0d6199b301a9eeea3567f525a1d4efe93116bc3014de
font_01_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 11012 bytes
SHA-256: c49a70e7b1ad8ef5526cdf95ce5898eacd96873e83f84cc20cb77374dbbe4f01