Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f604ec17c61213b…

MALICIOUS

PDF

86.5 KB Created: 2021-10-04 12:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5e48907346d0d6d0c8d6a450b698c971 SHA-1: 10a20e52953aeaa93adf69aa372795c889b9415c SHA-256: 8f604ec17c61213bfbb4374c0fef535c5ea76ff4bdc3c681e392146dfcd1fb32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the heuristic firings point to the PDF's structure being used to host and redirect to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=lost+my+driving+license+number PDF link annotation
    • http://marleenjansen.nl/images/uploadfiles/tekesofunozagerikogul.pdfIn PDF document text
    • https://krishnacock.com/userfiles/file/jofuwufekive.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/xutugarulidufujelono.pdfIn PDF document text
    • https://mayxaydungdailong.com/media/ftp/file/80792376590.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/zuzibigesaso.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/10523884743.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/zisitewiraruwov.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091817341491.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d433a6f561---dilagumekaporavodotusejun.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8f39a2edaf55f4f8e59e3fb3400fb41f/rugotugeg.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/83643149333.pdfIn PDF document text
    • https://tempegaring.com/contents/files/lugirotixozika.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202192313165407.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/sekiwebikilegis.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/255469102.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/54462894009.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/bibubitunukifupe.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/31655831365.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/89814605543.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/soxinajumebasesogusitaga.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/zowetumikisuzepabigo.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/niler.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/xuludiwifiwewudix.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144879921ed7---vekenilope.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_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 17860 bytes
SHA-256: 26479f4564723d9267475a04508f92f0f6584c4ebcca0c2c32284f60efb0cb48
font_01_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13309 10928 bytes
SHA-256: 6c213f56e8a857895c66f17f8c5d800c8bfae62f60f33385f2139b889602c141

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