Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cb0d2b25b2880a…

MALICIOUS

PDF

89.7 KB Created: 2021-07-31 12:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f68d3367ff480992f9f553327b7b175 SHA-1: f15426b01c677255f559d9987c30e761909a0eaf SHA-256: 33cb0d2b25b2880a732e71d7bce3fba9570a35ef887cc2bb7cd067079d345fcd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be hosted on compromised CMS upload storage. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://edu-mate.kr/_UploadFile/Images/file/79536652241.pdf In PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/48212623170.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/bitexamesu.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/93633969263.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43cc9fe0ca594ca1a9eccacbdc410a6c/99992464795.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/95117305904.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/abcbcb4ff99ffc2d42c6e0992ab50be6/neloduziwo.pdfIn PDF document text
    • http://sns.hu/_user/file/zotoketamemufegexefunilik.pdfIn PDF document text
    • http://abnicum.com/files/file/73381769981.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee29b49efcd---99459827529.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/kaguwalonu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/94f286542882e693198c1dd933c76719/3967250197.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/30814468669.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7fe33413---nugazifexidob.pdfIn PDF document text
    • https://dietacud.eu/upload/file/mikelijivosixiwimu.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/59357748812.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/02e48f2722711995d9e2d283f30680ab/80295010871.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/vusoferatifuf.pdfIn PDF document text
    • https://areicon.com/images/file/59639538576.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/15970311559.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e5b45d06---ritijogojo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/065eq697a64vec9rh0kvdv2lbc/dusagol.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/ruduvavile.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/10710086021.pdfIn PDF document text
    • https://austarpharma.com/upload/files/kazuratibarumadilupug.pdfIn PDF document text
    • https://bursajp.com/contents//files/xedurovimimenitifebofalov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=do+the+apple+cider+vinegar+pills+workPDF 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_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 11040 bytes
SHA-256: 8d9c4d98c613c499e332ec8226cb0bf0e705a45141aff384f4e6e48669fc23a9
font_02_sfnt_off00012e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3B 16412 bytes
SHA-256: 304f525f942065a819e4d369aac587735b39888e78b4b7a24da3c0347222d2e3

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