Malicious PDF — malware analysis report

Static analysis result for SHA-256 210b94d057cda178…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 00:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b8cacb3309729b52be5f1661be0805c1 SHA-1: 60ed841cdc2df27d156729020f8ae9e34313ad40 SHA-256: 210b94d057cda1787019cb7d17193531d10129dcffdd5d61620babed0a9ec08f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/44268333815.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef828eac78---39249044034.pdfIn PDF document text
    • http://fournitures-reliure.com/prod_files/wawaginoz.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/jedugusadu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba9ac34da---fefenezasixuvalazub.pdfIn PDF document text
    • https://manenshop.com/upload/files/sudofe.pdfIn PDF document text
    • http://signauction.net/userfiles/file/murotomugapirutomivekijas.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90696e900---87624524298.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/muwonikal.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210722232923754.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/89336309248.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/ac2f27712ab07a9aabb514b5e3031edb/85631083436.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f9bcac46f---nojaja.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0683e2c123a05fae87091efe32557b35/mubodetowerexarixojag.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/nufuvalas.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/48394617861.pdfIn PDF document text
    • http://vocembalo.ch/userfiles/file/35978749068.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab36cd7aac---lejozezalawela.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/kanogubafod.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ff5c600793e2e0560ced46062da705b1/zuroserinu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608640f2674c9---59876798814.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2c15afc34ce73d7f7e1ad115a43627da/pujulex.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/159c227fc3b6eb65a866d2a0ae1e9e36/11190880531.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949cb458782---47340940804.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb286ab187---38446179009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=reversing+secrets+of+reverse+engineering+pdf+downloadPDF 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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 18572 bytes
SHA-256: 53a2e552a1c9a9d152b8ede9310134a21b8ae8bfbcadc4e58ede85f0747e343c
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 10992 bytes
SHA-256: d24d3667a67b8d2b3efe624736efbf3d5946700aac7ef0e0f1e94f608cc8fed2
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1