Malicious PDF — malware analysis report

Static analysis result for SHA-256 797a1a40251a693f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 23:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4ffccc861eb229dc823ce2314663387 SHA-1: 93db5f241b0b710dce106c2cb569c4ecca08cf27 SHA-256: 797a1a40251a693f03781b8cd9f8b656b9a91c735fb3da58d83feb48ee9f5ced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=super+cleaner+apk PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361b4f1c707---61474629076.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/totinelerezadu.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/pijekebivokenobegiv.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/wopok.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210909214518.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/jasavazozebogizebowebuzo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be00838619---fewusefojosixapuwuji.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/76447408346.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9a8470db---22824098524.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/rabarowegezujixozat.pdfIn PDF document text
    • https://ratosatu.com/contents/files/14907844391.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/66752389066.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/85459150613.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/redarew.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/24272288483.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/kagopi.pdfIn PDF document text
    • http://clingac.com/d/files/21150912877.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/pekizidabagowetazakodun.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/31483523088.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/kedijuravurizesitiluzoz.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/62463942207.pdfIn PDF document text
    • http://artediapharma.com/upload/files/pisibozerogapezotajerizi.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/tikonixu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ce844cd6---43126104971.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/repabefo.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700f73da2c---vamevuxilesekul.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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 20100 bytes
SHA-256: ca59c4b77bfd9a6332ebfe2642349a95ac4e8cfa444946f3d70c0a7bacfbbfb1
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 10156 bytes
SHA-256: 2b986cc3f325184cd7462945757e0af60f10ab8ee65086c6d3e7cf007eb8fb4b

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