Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ccbd6ba7934faa…

MALICIOUS

PDF

88.2 KB Created: 2021-07-20 08:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61a456fe2394b89483b845a732f22cf2 SHA-1: 8afc726e5e64b041226f5d0041d5e3f0eb123f31 SHA-256: 43ccbd6ba7934faa20db43006892f8cda937f7379f7f4ff73a47dbe17875d684
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the intent is to trick users into believing there are new payment instructions, a common tactic in business email compromise. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://domholidays.com/userfiles/file/73383932200.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/wesewipetajitobugavej.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/16556303523.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/de8c03106c4e1574a00fb91e965c78c0/gofasutaxekuzaruratalabu.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/72581930640.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/kar0h6knbj2vocc8mr6dfe8b1q/57747019968.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/lopoxoposadume.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/13785444308.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ebfebb07d---xitofezevejapukiwofum.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/wetufezapugugino.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/53751006765.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160de8675d4b8d---potezaxavumutibagipaxum.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/8de32976fa876f6b904ea6c9e5099a81/bumagereworolifejozutamam.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/dusivevetidotafofif.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad56870f778---2071814347.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160774dbe33aeb---76232702102.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/liluxifudubozosiruxorifax.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ab562d25af4---wemenegivelinapek.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6fc10214d---dogiraxolorewurudawapereg.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/zorojazifew.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919b587feb2---jasogu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607132c55b02b---2823850432.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/15653391803.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e9d05855c---20154953455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=reading+a+credit+card+statement+worksheetPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f4eac3ea6f3d8cb874c3d0fc6147b4dc/ziberimitexumatixaxamotu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 17544 bytes
SHA-256: 37dab471981cfa72d88a63700d28cdd23191577247b43363a8ccbd7c2f864625
font_01_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 10996 bytes
SHA-256: e13271e9bbd48425f3f902f7c7524d603025c31417440df2c1ccabfaa943158b
font_02_sfnt_off00013b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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