Malicious PDF — malware analysis report

Static analysis result for SHA-256 917a9ac59622444e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 23:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 032394da3ab43dd6ffd7f5f0fdf69c80 SHA-1: ab1826b4c5c51b24a14107b0591de4b3ded66e67 SHA-256: 917a9ac59622444ef671ed20f0c0c0cd981597b802bcd2a2f6d841bd750c0c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple compromised or disposable hosting domains. The presence of numerous links to PDF files hosted on various domains suggests an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, and the document body was unreadable.

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 http://afgventuregroup.com/cfiles/file/sefavaxufulokuwiwole.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f107303008bab6f23e6305372d1d4575/45169950551.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee29b49efcd---99459827529.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/30763727308.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/77129996294.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/778e2c79402170bbfe3c19ba45bab9cb/59609105861.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/24515544134.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/tijufijigipi.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/sadefalubewagujuge.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cace7225b0---82581566939.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a426af0273c---vugebofud.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/42682214684.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/vatora.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/54971111535.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/zigituvijo.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/89804888823.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9f6de57aa1d735184b6af0580aad3004/99266379117.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/pevudobipajekuxuwigadiso.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1640a77ac7---77793270640.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/vutatafexapifavezumumivoz.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161294c3a530ce---befowamawizoxubuv.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9bad2b793fd7ee51de1596ff2b09a1a6/60916952837.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d9d1618d1---kagowelapadase.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=blackbody+radiation+journal+pdfPDF 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_off0000ce97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 17124 bytes
SHA-256: a6bc3ecb638b64f73a41853db19ef6e385dfa82750b5c1421b13ee29f9e1e8d7
font_02_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 10940 bytes
SHA-256: 47b92951866d5be685adff8d3bd526abb5b2678031193eda3bb63f34121b1bd7

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