Malicious PDF — malware analysis report

Static analysis result for SHA-256 983f99e8fb35ddcb…

MALICIOUS

PDF

91.0 KB Created: 2021-07-18 17:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62403d9d16e5ee1ebec2b5745c84c3a3 SHA-1: 1a73ace7b571e457c04a15ecc038ab67b99ffb8a SHA-256: 983f99e8fb35ddcbd8ec596252e614c88e3d14cc936cbeeddcd6f650259976f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites using form builder plugins. These links form a link farm, a common technique to obscure the final destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d150701122---76639252322.pdf In PDF document text
    • https://adasms.fr/userfiles/file/51765884398.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/de55ee0b86238549b464483ac59a7e0b/jiwivokisefima.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fusovosunaxewixiranafuv.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/14503481927.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/wugoxaxaxufufofumoxazolej.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb2055532---83611747867.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/lexuxakinemodevitiz.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ace8bd351246353e2d0d34b3668acd74/pekitiniminesabizufitu.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/fopefumul.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b773d2e20b09ec16c15840899e4f4514/demawefuvovofu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8dda2fd0282d5fb3bf88d3d0c987b21d/nuzifupikujunelipotat.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5fc71a2lj608n4vnk6gjgkub7k/45050931197.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/i13ld9kov82ort7iqoo8ffjd53/69493906163.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607819f00793c---30693333078.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/luwidad.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/5bcf35ea28630ef742a02cbaa1d91c71/45625220655.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e914a44ac01---74976454639.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f1d63773---6149788319.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d466268d5a0---61203322518.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d405da4c1db6282cd14374ab81a04604/renatoxesafal.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/sefiwikimatizemaxadu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160700fec60491---revepuxo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/lalubogabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=my+brilliant+friend+set+in+what+yearPDF 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_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 17340 bytes
SHA-256: 341dcda3e899b0dc2cba5b80e0581a125028ebedad4475724c7cfb9556d86654
font_01_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 10664 bytes
SHA-256: bc404fb8d4b8b12d9ec806cb41fb6f2171c2b21bef38c2e528ae3409dff8c50d
font_02_sfnt_off000144e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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