Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc84309607d49b24…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 19:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 16d753ff4db8f9181ec24653bc9695aa SHA-1: 1b7ab8226cf74dce2f3cc6a4a562e2f7bb746e17 SHA-256: cc84309607d49b24c5b8e0a0af0fea6091668ad9d3ada91ceffeebdc167dff58
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 link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://oniceh.ru/uplcv?utm_term=spiral+from+the+book+of+saw+free+online PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614048881606f---tekuxufivosogatuletixir.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/25371401750.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/28009172111.pdfIn PDF document text
    • http://sjanzee.nl/file/91238336353.pdfIn PDF document text
    • https://megalight.lv/uploads/files/83677599214.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2b96729ebcc837d90bfbc51000919134/26177068910.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912102743.pdfIn PDF document text
    • http://24cvety.ru/upload/files/58389808312.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/75395365983.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/54074564004.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/roretipil.pdfIn PDF document text
    • https://ms01bet.net/contents/files/femomerasanoj.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/kowutejuvuzujetodid.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/puvidon.pdfIn PDF document text
    • https://designclarf.it/file/fotaxilimabenifoxuzogimo.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/62685129558.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed84722138---zakolagoti.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/dudibamogaziberodafidugo.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/jurabizofariwejusejipaz.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/mujedasipozobukipibes.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/bidurobusema.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/ginufusatufopumuteju.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/76924493701.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/74707727284.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/8110572396.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_off0000b08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 15120 bytes
SHA-256: 38009a4a962a144fafedd92d0c7ed5953f125955f646c9e74601bf0ead9ec0d0
font_01_sfnt_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 11016 bytes
SHA-256: c5c22e962936238078799d020ddfc12b29ce282743c8e9aab8d48d3d49fa43f9