Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb7f0c357f3b8a8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 21:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1e705b9511c9f4f00d8bb5e2fb3af71 SHA-1: 20ed068bec96d1911a80203aa8d995d963749386 SHA-256: cdb7f0c357f3b8a8bc92ef4052a91506151c5e8e1bd3754ebb74cbcfd55811a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristics indicate it's designed to redirect users, likely for phishing or malware distribution, and the presence of external URIs supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://oreade-breche.fr/userfiles/file/43565394984.pdf In PDF document text
    • http://e-park.es/img/uploads/files/56679923331.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b379f582---kopenekilinimad.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/pgdm6dpqd86shplcghph4h1m95/94149283112.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075df3f7cffe---25179074510.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c6e3ee92076af69603fd9d43a4d7573a/xawonowoxoluvamazixinak.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/89346898975.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/buzubozowuwinum.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/40990800571.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613173c77c111---powalevezifamivawasonog.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/30153940057.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c943ca6b8ac8c9bccccd3442076c04ee/fudalonunijununabi.pdfIn PDF document text
    • https://aayams.com/userfiles/file/naferazojojigorikakikevin.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1cd987f656c3a8f217986ca56baa2617/92330226486.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/eigh9na2269o9rqgcl4habdqhi/58380905763.pdfIn PDF document text
    • https://basisnomor.com/contents//files/gevizenek.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/51566579536.pdfIn PDF document text
    • http://arslanemlak.come/file/96008865042.pdfIn PDF document text
    • https://birotex.rs/images/files/wejapeja.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/24636966192.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/97912553431.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/47810616546.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/11815505917.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161331ad55db06---xeruwurirewemavigap.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec9697ccd---kerimivodopiwijasisefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=blue+devils+brass+audition+packet+pdfPDF 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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 17436 bytes
SHA-256: 73b479388805115a43df6b76865c3c6435799817d0bbf95400aa0f8e212c45fe
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 11064 bytes
SHA-256: a1ed7cbc6d35f67bba512fd6309a7a8c3474b8e3cde755176f82475f684171b4