Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9340d222442702…

MALICIOUS

PDF

94.9 KB Created: 2021-09-16 09:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 849e10e4468b0a65067cbd3a969270d2 SHA-1: 500c6c4e0daf9565c90af9e91c6a1ca927b80781 SHA-256: 6d9340d222442702cec2b300cd178d9d6e0d01a9787e7efd995509e65089becc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings indicate the primary attack pattern is the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=instagram+followers+free+unlimited+online PDF link annotation
    • https://cakkue.com/contents/files/balisakikibepato.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/96973293304.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/88431676592.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/74777843469.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/30418984308.pdfIn PDF document text
    • http://devison-matras.com/upload/file/4653349665.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce1fcde75---68568860563.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/30124320797.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/vevesisozuged.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ma983ro6l396bsfi346b5j9chh/2978624725.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/getil.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/de69bcd5b373b8dbf652390c2836c376/sokadu.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/14506921176.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/482565678.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/15451166082.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/vakaragiguzim.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/nowutumixa.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/97488959746.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161341490a0b11---gabetubejudapuxuzopulu.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/62037515594.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/612f4628bfa99.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/88225093543.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_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 18416 bytes
SHA-256: aaf4b1f73fd39f2cad3bdb7afd4c3138f351c3d6a444c05481b2602984670580
font_01_sfnt_off00013cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD1 10836 bytes
SHA-256: 9f4bba47974671299027442f5febc693de05a6d0f0a74e14afc299aa8d63cc6c
font_02_sfnt_off000155a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1