Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda199dae798d46e…

MALICIOUS

PDF

98.5 KB Created: 2021-09-05 16:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9dbac5292c94f065212b4e576b4c443d SHA-1: eb49f33c311dc23e280af4e3329175e1817b9265 SHA-256: cda199dae798d46edaa5c0523880c28793ce49a110f5143ab0a19047788b0b1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics and URL analysis are sufficient to infer a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/9n5t87agpov1svk8496rcsrp3f/9090046866.pdf In PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a061f96de5---pajunafamubimaneniv.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/midiwodawe.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/28394194775.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/fakulabuzexex.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/2913805579.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/74635687426.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/89623863054.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5nm6b732t2ke4cjgegchql36fa/fijodapojinaxugobu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160888e6554e3f---45570344493.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3d8690f38f0df752066f6e6e9f2e89e2/dirorat.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/30cb61vo4sslbvru8rp9449ag1/xupatinokekudo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba707b511---bifajekipim.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f59d42c66---80098484480.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/ranaj.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/15654908482.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/84166051268.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/49223957382.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/89190765270.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/bizil.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/ginorokaburajiwurato.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897c457452f---gasaxabuworobapifiwon.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/43847438290.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b893089634f---jonezutidopazifegigigeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=psyche+and+cupid+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_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 19844 bytes
SHA-256: 7cc62e7e3737be4be22f0fa4615a7905ccdf794fc51adb92312b9b0df41b748b
font_01_sfnt_off00014c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C41 10568 bytes
SHA-256: 9ab596cdcf30aa19d6f5695db241abff0646b5b0a76323db1b3bb39c990ec639
font_02_sfnt_off00016449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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