Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d1698c8bd61b0d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 10:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b13639e57d0d4de0924b203119cc0b9 SHA-1: 5c0014babbcec0beb36ac833117af0ea6b5d6f38 SHA-256: d5d1698c8bd61b0ddf59ea9f657287f2899a857670ebf71b8bf1996bfecd2d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the nature of the detected heuristics strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=text+messages+failing+to+send+android PDF link annotation
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/soxikadixugunapobefedex.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/88493710099.pdfIn PDF document text
    • https://netpage.info/userfiles/file/75087895580.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/31821638962.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/72712281244.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/jofevugepusuxowiwig.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/da4d79149b37aade5f93819c35a7ddbf/95923512141.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0rqin9r6gsmk0ipp923rfsnh21/walatevosefolokuzanajatet.pdfIn PDF document text
    • http://www.bash.cl/media/file/24021754012.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/wituredolotuwu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/43352620499.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/lusalogalilezudi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/910674ed6fab04ed97cea5c31506f7c5/14125769709.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/89875497673.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8388d981---30778816399.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/xeberamewasobuzar.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/91920166147.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/nezisi.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/dovatozerotadoseniz.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d33e30b1---netogaporawogewazufu.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/jodajiwemolefapo.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/luvilapuretonadexa.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/duzidabavutalowataberuges.pdfIn PDF document text
    • https://italvaping.com/file/zidiwamidofevelojibujos.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/pimovebadi.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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 10760 bytes
SHA-256: cc2b85194294ae63b6a03124f1b8c29d659e8ccfa46620fd9cdbedb32814995c
font_02_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 17836 bytes
SHA-256: 31718bd581481f50a39a2abfce229c0aa12a18e6cc957d9e883cc1049d032882

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