Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c89617ca7289acf…

MALICIOUS

PDF

81.6 KB Created: 2021-08-31 09:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 208fb23051f03994f86deb9beb387fab SHA-1: 4c5e552af712a8d3c7c0bb79d78f2b45ea8d2633 SHA-256: 5c89617ca7289acf5058d7241ea6fbd0bf3e5c485a088c16f9cf5eea2d7d6e88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators points towards a tactic of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5a31836dedefc8c197e3e867302b6df1/64092634649.pdf In PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bf1b2c1a2---58676239295.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/dapenoke.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/13191132275.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/77068068998.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/68486586300.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/71ff29ef5b259c825144b1a9217d3995/94156818626.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/67271448245.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3abeb45e38a5be0a30f7478d87e49510/gufukunonitewelun.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/sovuxalemil.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/51766588506.pdfIn PDF document text
    • http://armanetti.com/images/wimelegobatitexonuxu.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/siparadumivatujilumo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/48929172088.pdfIn PDF document text
    • http://kezmosas.hu/files/file/33131032124.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/zuzedax.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/zadavebumirasawabojexun.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/55037381317.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b907aa2d0b---87178222467.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/23390452455.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/vuzimavakanuvuv.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/jarikifataletom.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/3114662645.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/24960841002.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210818130759.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210730075020094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pinoy+movies+streaming+online+freePDF 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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 10736 bytes
SHA-256: 36765fc97dde8aa5a9d3816784c44c59efa865b5038b3270219264db91ae1693
font_01_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 17976 bytes
SHA-256: 81bf107f3dc580d9055fcdc983163cf6f040fcd51c1c17b1c42424c5c3d58b8e
font_02_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1