Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2dcd12486570f75…

MALICIOUS

PDF

87.1 KB Created: 2021-08-17 01:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b76c15fd6488d44d9584b2752e6ae203 SHA-1: 78e4c52c3299de01a995bef8e29273d34bcc3b1c SHA-256: b2dcd12486570f75445cd5a528e7f3fc027efe3a502a7cc73f052c159e921f3c
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 0.9993

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f5d21a01---33903303805.pdf In PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e63c34764d87e861e0a8df4f1a466d2e/mudomivew.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/varewiga.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/96782395600.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/40117932523.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/63020102053.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rt6hn7ipd7q7t1nshbqu4m8s11/15935667032.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/nerusufelija.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/fodagavusogapiwufibaka.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/kejos.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2a9f099c---16591105998.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9168e826d794451cb385bb9062b9a058/49658379495.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/07aefd627495b7a59dcd461caf963ea2/66845795023.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087702322b38---kudinigejevanulivogusoku.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3873879dd43eee6f68728dcb0ee9c1a6/daxajux.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/4956265836.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/15147762948.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/j1j20n56p0amsi738orvmvr1e1/18627789338.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e7c363109---17891772517.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/novok.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c4ec80c5900aa904d25fe7dd73e02352/nunumonib.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/korejaxawese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+hyundai+value+editionPDF 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_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 17744 bytes
SHA-256: 35961ce2e33beecb87cf8a2e8c02d1ae43302b9690de1eb25150dbc667414597
font_01_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 10520 bytes
SHA-256: d8b18e2c5c20944faa36aee79d6a788e0fd58f11b1b56a7a7433686cdaf10bdb
font_02_sfnt_off0001360f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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