Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b2fb792c9be340…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 17:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdc92d6e0e21e14d33ced3d2f42a4f79 SHA-1: 744fe07007c8cf6ee4ff8aedd9d80fa6991bb6b3 SHA-256: 98b2fb792c9be340af59a8d3be2b1a0afd8f698cdae28073ce59ba40ab372858
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, with several heuristics indicating a compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://design-klasse.de/ckfinder/userfiles/files/solepidekape.pdf In PDF document text
    • https://activsport.ro/userfiles/file/zogatutipedozixagebagavot.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jufesegugoronoref.pdfIn PDF document text
    • https://parc-hotel.info/file/99122981389.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/79547003291.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ut354d4nuer70bs1lguq21ec2/naduwevojaxuvoxofopegaxu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/62129952257.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/bonilibuvomafafabe.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/22556117014.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210917205736.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/vujedizaxikelatew.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/68200912376.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/jegadafoponuxogurilufoga.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161328f6aa4047---55190430370.pdfIn PDF document text
    • http://kahasat.cz/data/file/63802442354.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/37016744224.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/tovuzavepuwuxaxo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2eb63d92929b5c7f001a6fd5a06ad7d6/45188544291.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/damezejoverekok.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/temaradubesopexegofi.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/88293053643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=modals+list+with+examplesPDF 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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 10636 bytes
SHA-256: 1696a5eaabb24e43cc107eae14aec822f3e9c5f580a17c86c29f1c5a4bc5580b
font_02_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 18728 bytes
SHA-256: 0081633c99174c55af2bca8651ce4cb3787c858b04bfd91420788e6ece8032e5

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