Malicious PDF — malware analysis report

Static analysis result for SHA-256 d387a3dab763fe64…

MALICIOUS

PDF

74.6 KB Created: 2021-09-09 16:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f09b474c04a625f646a3d1edfff74a75 SHA-1: 8a6f317f163c6755bbb442daa41680634e0be6f3 SHA-256: d387a3dab763fe64d3a8a416b189fdef10cf7c4053c4e0f126a5f7b1e7d882ca
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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The file's structure and URL patterns are consistent with a spearphishing attachment.

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://cructi.ru/uplcv?utm_term=game+dev+story+apk+no+license PDF link annotation
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/9792038869.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xabuzapejo.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/21926620900.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/64219861387.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/11351217597.pdfIn PDF document text
    • https://fuoriscena.eu/file/sefetav.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/wifuboga.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380ba406624---34455463600.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/wizeliziguzaxuxeguwibib.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/58482132652.pdfIn PDF document text
    • https://orrizon.ru/images/file/25875705054.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/13466334594.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/32567284449.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/28997280638.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/nigiwirom.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/lexezizifovosug.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/70992006533.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee00fe2388---20452901963.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/78399583282.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/98386881987.pdfIn PDF document text
    • https://digireg.gr/upload/totoguzijeronojor.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/gorudupot.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/85815814a85b33b896b2ca15b0881b53/madidabilod.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/bovowun.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_off0000baf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF4 10984 bytes
SHA-256: aa3f552a1c787aa4766dfe992a82fc99de432fb7ef696b1d91f50dd8ddb4024f
font_01_sfnt_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 18488 bytes
SHA-256: 837c8a8af706a54917743b37779540ccdf1f92f282318b147e039e806ac94b47
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1