Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fcc66a2af7d670…

MALICIOUS

PDF

67.4 KB Created: 2021-10-02 11:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 46a43f1ba24413a87cbdabc08e6b81dd SHA-1: 5930f765f3fefab55a34cf2f6e0788f83b1a822b SHA-256: 10fcc66a2af7d6705f0f0bfc691510683c3c1af2bb33fd869e5605bfed0c8a43
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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=zucchini+noodles+with PDF link annotation
    • http://28777886.com/Lpf/UPFILE/userfiles/files/45777338668.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614e42ae852e5---fapuxafogej.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/kalov.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/81787403883.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/xafogebi.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/71636085994.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/xafepuxola.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab9694cf6---mawugazororuwi.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/wamerufukomilawos.pdfIn PDF document text
    • https://chilepools.com/contents/files/puzedevuporokegakuso.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/kanexulaxiju.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/53038605398.pdfIn PDF document text
    • http://rs-entp.com/upload/file/45776554937.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/45682851376.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/kexavivakalu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/29467755580.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/nubexoxoluxujilepupusimot.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376fbd8526b---doxutamafakakije.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/biravonugixebabugagawujo.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/ruvivupifulobinixopeviv.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/42092487210.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_off0000abc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D4 15004 bytes
SHA-256: d2da9f2aad51b5008f8f94b457b82c80866f095085df1fcdb87f6397fac96b1f
font_02_sfnt_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 10352 bytes
SHA-256: 9882e867415992860255cf00ac85adfac3cc7c198b95a49d32d814c3b22e46ce