Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b79f35a65131d9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 10:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da3658662bccd9ef02dfea1703469f40 SHA-1: e1a32cec346ccaa9145edcd1762fddbfe4ea86e6 SHA-256: b7b79f35a65131d90b8875304a21df82b252ff45270abc54e1a283ca1c62f419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. The embedded URLs, while numerous, do not contain executable scripts or VBA, and the document body is unreadable binary data, reinforcing the conclusion that the primary function is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfd1514503---77558291639.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/67b8fb7d4199a28af073e12b22939d68/lisagomijasoniketuvered.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/e9b29jf11ii9upa96ra0rvjr35/61899582237.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/diwas.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ddb5d1420---kivexosu.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/rarinunizutadibukager.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/sr7ae0t9v90alb58p95gqk4c2h/xujuveririf.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ee5f3510543a4360ff4e22a878ca86f8/38274767181.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bafb72ecc---1059427868.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/relonozepa.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/kabijesixusenu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d66ecd66---dobidiwokasiri.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfbd09cde4---43971736437.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/510d2adb0ea0018cf1401fe8e981552a/67109218319.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca307d7717---83392719393.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/be38bb22a1403d9045c552a04f7bc236/19219814237.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/61049245749.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/lipav.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/40054674040.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210822045933.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/mapofegunegadi.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/51145190858.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/e2vq39919na10tt26qbpoe9j33/88148339676.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c970473f96e---noremulivebu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f7a1256b---84386310594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mophie+powerstation+wireless+xl+manualPDF 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_off0000b439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB439 18024 bytes
SHA-256: 58ec1f3f3905465478fcc94e8944406001c84684b27889325630a006672c4c9f
font_01_sfnt_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 10800 bytes
SHA-256: 737c25d27e297a96865935a0fbeb058b871eeb8397cfeedd52908e2b29a3314f

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