Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6407209040c80f…

MALICIOUS

PDF

90.1 KB Created: 2021-07-31 15:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bb9d36ba463e06ad91f7c3100caccfc SHA-1: 70511dceb53f0341b7e9ecaf0f0b3aec961fcb2c SHA-256: 6a6407209040c80f11d7cfb8692f3952f5e096ac7a963972c15f82b389a56dbd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of instructing users to open password-protected archives, likely to bypass security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://sity-luxe.ru/userfiles/file/62351533410.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa727e309d2---62457376580.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64bb42c41---79537625017.pdfIn PDF document text
    • http://chieucoingason.vn/files/gufutasewixes.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/1f38e07b4b699934651f1976ec46bf28/manalerazivaz.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/sixokasozuzogirerasenuje.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/78354437209.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/78332586356.pdfIn PDF document text
    • https://2acontractor.it/images/file/vigifi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kasokirusipakakurokaz.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/juwatawajosez.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/fudezujagapotimegejuvela.pdfIn PDF document text
    • http://banquat.com/userfiles/files/goviboxif.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7de6858040fb8b17dcbf33ddd98c8d36/bedekutegu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63d2d279f---kemol.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e503c734---65236755817.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/nupusopimetepivo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/98093136192.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8ed64a5ab821f7a1393136a4b5ed89b2/52308903375.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b06fe8a6d0c---23970372137.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/2868bf44225467f8e5146b6ef55dae99/tijuxanofutuxi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c717295a906fd20a699f7903aab53419/65928308350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tramitar+rfc+gratis+en+lineaPDF 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_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 18304 bytes
SHA-256: c22cd09c66871c570155a00e4d61a21be526669d65370dd711e58fc924093330
font_01_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14096 10520 bytes
SHA-256: 3bd40044fafec77dce13dc163085a6b12661cd2ca51ffaa0550060be370b28eb

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