Malicious PDF — malware analysis report

Static analysis result for SHA-256 77169aea3faea72d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 09:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7925b94f890f9db5bcf822b3313dbcef SHA-1: 4d324970a67116ad41088229bda2fbe7b31c57a2 SHA-256: 77169aea3faea72d269d1bffcc1e9427521ebe181a0de167cf3e268b742a5889
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While 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 0.9968

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://tehnicgaz.eu/files/file/zetudepemomavava.pdf In PDF document text
    • http://cadelupo.it/userfiles/files/pegikitejizune.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/14868509169.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/53351707.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210906080719.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/garanimiwoje.pdfIn PDF document text
    • http://africareview.in/userfiles/file/dukelapig.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa84bcafb6---15052925205.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/vorasono.pdfIn PDF document text
    • http://donghotam.com/luutru/files/dawokimurupiwudatexepup.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/dujigijozakasaj.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/33474563375.pdfIn PDF document text
    • http://tencanpowder.com/d/files/ziwofozisixanowo.pdfIn PDF document text
    • http://ativn.com/upload/file/fofawumidivasukir.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/94429776465.pdfIn PDF document text
    • https://thehouseproduction.net/file/wuvodepiv.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e2vcrh9h132fvur1jg09hnlsk4/mafadazaxadinogav.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2dfd10dc---3479647139.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ac955ea128aa0702e3edf5d22987bcca/riduzimamazubukakogesito.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///11226112298.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea0452035a---65516251278.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/mevuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+gta+5+mobile+apk+and+obb+filePDF 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_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 17768 bytes
SHA-256: 34aebe80642fc6388e3aa1b014b4aac9c70046f6c11d11814c6d216cab952d6d
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 11024 bytes
SHA-256: 2cce9cca1e787086e5b80331bf45ecbe4831a882aeca77dbbb8e5757d59aa066

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