Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e93d0b7ee1c76c…

MALICIOUS

PDF

92.9 KB Created: 2021-08-22 00:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 0459f7da973d9030433e59ca65347669 SHA-1: f309f7b4109bae15883b25eae22c216f3bb122fa SHA-256: 16e93d0b7ee1c76c082df57a5a9124e8cb1a32b65cb61091cc544680c6d3acff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=how+to+install+presonus+audiobox+usb+96 PDF link annotation
    • https://bazab.ru/ckfinder/userfiles/files/78455575472.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/41729324158.pdfIn PDF document text
    • https://yellowstonewildlife.com/zipozufiribamezazelop.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8faf617e9f401fe33fc19280de1039fc/pigomi.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/41645229049.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8af926dd1---83987056085.pdfIn PDF document text
    • http://hodori247.com/uploads/files/78538396497.pdfIn PDF document text
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/64507413720.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/vomafo.pdfIn PDF document text
    • https://clickbox.ro/images/file/82063118586.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/rozez.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/71066104642.pdfIn PDF document text
    • http://vodnik48.ru/content/file/38353841702.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/ramutupoda.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610577b204dd8---41097570659.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/9270ad408fd82c192eb5cb4a9f3b3b4b/bigugap.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/moxosezulasumir.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0d4177cae0d909db266c1faf1cabe776/redusani.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/tedetutefugodedovulatafo.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/zesane.pdfIn PDF document text
    • https://sealskinz.ru/files/file/puxone.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/33760259722.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/notajezisagudelivutas.pdfIn PDF document text
    • http://olympusflights.com/files/files/gones.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895835c739f---80646179621.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 11140 bytes
SHA-256: 4a7bb84a6c6052f7f8d34ab0f0616d4fc0ae4e817b3ba631f4dd11d623da4de4
font_02_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 2688 bytes
SHA-256: a2ac081e08affb0ecf0a940f0eec8b4be73ee6624f5ae6ef3b741cdea718dd26
font_03_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 20528 bytes
SHA-256: d20e45dd07da82db0ef18fbd4fe7570401a09d1c28a79448a181dc39bcf3e15c
font_04_sfnt_off00014cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB4 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d

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