Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c8bcff3fbe8634…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 08:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db71d5b1680d290efaa7f647bd1d9c8a SHA-1: 16e9f3c10a9fa4d5b23d78226d007c4da0cfbe63 SHA-256: 74c8bcff3fbe8634fcf5bf3499ebee91b226d8d9b9623edc4e8bd8e437efd097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=cara+screenshot+redmi+note+9s PDF link annotation
    • https://aznamaste.com/ckfinder/userfiles/files/56322396241.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/53623827775.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/79212270903.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/2589497979.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/tepefe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/42662368218.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/jupatinefunosumoxebagupi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f9d60131---30025598325.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe97d5858---86256390256.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa0054198---lasolefopelijof.pdfIn PDF document text
    • https://kueapem.com/contents/files/senuvomeva.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/dujutapiroxivuxuwid.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/dokavivesosebibalovi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/08kko85js2mqfqjictvp4b53d0/89789179629.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/64151494910.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/surodotamozurop.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/logeka.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/50165fe47a77ab062c5ade3a669fa135/nunufurewedabupibezeluz.pdfIn PDF document text
    • https://linker.tw/files/nusepipe.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/40888043814.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/lifetilurubiruvexez.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/mafal.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/xujuniwi.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/vezuxodesikunavutawe.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/38174292101.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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 10788 bytes
SHA-256: eaa110dc34c958403b3c9ee3f7e5e8d0896343d6448320451831b43f3bcf9f09
font_02_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 17260 bytes
SHA-256: 163a692d4e8df13b63abc5d28d142e86beb36ea16c418c985d3dccefba72e639

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