Malicious PDF — malware analysis report

Static analysis result for SHA-256 a884713eb93f4657…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 17:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab7972433d6594b9482cb35b378bce7f SHA-1: dbb080dcdf4819f4de4d0bb5b8bf35c58ec0d18b SHA-256: a884713eb93f46572f26228ebf130f309df326afbf4a9db5987bec0ebe6b76ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=genshin+codes+primogems PDF link annotation
    • https://eminencesolutions.in/resources/userfiles/file/81968822675.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/96cf1ab4d5b1d8364fd3da56b09742c9/88860113593.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/nugidonopojobeguvipowefu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f1e9a8e28139a28c66f5f57b2cc8bdeb/95784619586.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/woparolapanorugemumelu.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/bomafobapum.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/76054058018.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/61878845111.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zoragowuzadi.pdfIn PDF document text
    • https://olterus.net/contents/files/fudet.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/mezosufoxidiposar.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090606452210.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/42299477349.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/40961466381.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/36618168994.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384dfc54359---beligovem.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/9597431393.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dfb738fd2---pibideg.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bb0e1fc5e11d236ea6a39606f4bff799/92314572286.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ba029068---bimolejebiv.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda47bfaf5---8117238901.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/mexuvugakexinak.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gutolu.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/gevujomuxazagujejife.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 17464 bytes
SHA-256: ec58bdfc2a56add1945831141a6cec5a6c7e958998e8501a361cbca6c92451c4
font_01_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 10692 bytes
SHA-256: 904fb2110f621fd6f822741940778f5235179c038ffdbc6b3753e4a1fe749652
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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