Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfda16ed3655973…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 13:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3bd4753c6f2f7aacbdab75fe9e960ce SHA-1: 705ea4b75ce852e5b178a730efc5287cff50930f SHA-256: fbfda16ed36559734dfcda0979fe6bbb19bd015cdaa13b6410188492e410ef59
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=rrb+group+d+2018+pdf+book PDF link annotation
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612187097248f---raduzodatuxuzebumuso.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5323d40d4---mopogumegoderuz.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c4bdf5aeeee9d5328be95a39baa6e116/kerux.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160705fa0e368e---gofegixujabufimokogex.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/50149158167.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6a45633034ffd65590c10eab0d39e976/39261926082.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/40733060604.pdfIn PDF document text
    • https://rintrans.com/files/tojegabukakunipokebilumex.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fee7b81036e2f6859f7300243c1938c7/buwomofaboxubanejet.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161275bb73476f---26529529657.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3344208845---64968845440.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/5e2980786fae677c65c6262d41ef7121/jaxavonomuwebe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7b3d67df---mituxeduxakomifegipuxiwi.pdfIn PDF document text
    • http://01host.ru/userfiles/files/54930995514.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/85458478241.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/bikibosakobojovak.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/gupovizukasemugo.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caaa7d7cb6---3875698537.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7b7a9d61---32389496120.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/44251ddd292024ff6d3b089937421781/35001971163.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/f9mt88crir4bible8vjhs9kq75/saxabezakevovarese.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/daxanekatifemotaru.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/46956576740.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_off0000b6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B8 15792 bytes
SHA-256: 0c89fe91a285bfc5cae6e4d94fd86d52b42d04001a40a4f263338a2625ae6397
font_01_sfnt_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 10752 bytes
SHA-256: 330dc16812b81b3c3c47279f6a77605158aded074019c2ac123981ff92b1da57
font_02_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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