Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0057dcee3b5faf…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 13:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0d98fccc30fce11fbf2b53e324a0573 SHA-1: b022e108cce69dd50917c8d11a10922e3ce48ecf SHA-256: bc0057dcee3b5faf9a5faa1f371c06b5d9060afc94f736970ae9f8f40d08094c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=top+five+rarest+skins+in+fortnite PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332621c8708---mifuwezikapezaruzufedutop.pdfIn PDF document text
    • http://surtek.biz/image/files/20150317_185509.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/9614415324.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/rugebupuvoma.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c2892dd311bad31d2d7d304caf5ede75/55316597891.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109070233182836.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147d2713bd20---vigexalararedikep.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161360f68ad206---14251895658.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/95601870023.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/mamufexanozoz.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/64479085986.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/wapikuj.pdfPDF link annotation
    • https://reazfarah.com/ckfinder/userfiles/files/milizigeno.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/vuriridebizemegevafo.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/vipikobibeboxuz.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/57092413254.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/sunosijeb.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/39412156946.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/liguwifurekunar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f054d98302---pofiwulovowiduvezaza.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_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 10424 bytes
SHA-256: 70d37a4494610a94908a4c5569c01ffe59af0a4227c1d255f12aebbacd6aae70
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 17664 bytes
SHA-256: 760b00fef6c52918d7a37e841219c504b128ad0894de9e4535f169e9a722d496
font_02_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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