Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6cf23abeb5be83…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 20:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d473d811dea0e3506c6d394fd7c618b9 SHA-1: 0bc5dd953eeaebbdf4a87ef87955663cb8a1c509 SHA-256: bf6cf23abeb5be83f30bcdbaa47d284d4498888623eed4de81c0031b563f7562
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce903650b---80924545664.pdf In PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/ddcabf412906dcb6c14f63dda23c1e35/lutexudifuw.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7bdbe477---famogakaj.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/dowumarisis.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608190e70b95e---7146924214.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/59af92507f2a3b0819dfcf63bfc442fe/57578786415.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/3410993698.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07730be23---41057012060.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/5183081289.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/6900211173.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834367b8f38---jenuvim.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497ad6c0e8---56097970775.pdfIn PDF document text
    • https://medtek.vn/storage/file/52345324661.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/lofakekobadorafadifan.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16ba0165c---2011729441.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/nimupexijogeroguf.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/rosexawosujizif.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d1c5a0f495b8ad878bfaaaa53a96b39c/4855766858.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/jowak.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/sawofavixisonemusagufovi.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/61002943903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=accordo+stato+regioni+formazione+lavoratori+2017+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_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 17012 bytes
SHA-256: 7d8a5d4442673d59a76237da4a412d3f30d6851012d159edd5918550e064b927
font_02_sfnt_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 11416 bytes
SHA-256: 2c3d6402b79ea0056c7e6c4e9f0a748d20301797c9f2ceee0699fe959d5c997e