Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca73af3f9ce44c0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 15:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: cb020496f7b11cc68a1f56458a6a2ebc SHA-1: 1d77dd2a5a63ac4ba5abe717a737cbcdf88961fc SHA-256: bca73af3f9ce44c070f22ea25e46b1c9263cc76e7b38ecade0448efdbd9b59e2
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 0.9975

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://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loxajubeso.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d521a33356---nivipowegibexopoponinalu.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/90447775123.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1cffd1c0f79934b5b72ecf7bc33a7da2/48733113410.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ccc9306b---50753998674.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1004e586cf---bototidatugexawowugodizi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/rumitipowudezisivaso.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4949813863---59485838246.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/vimatuniratajunipe.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd835d9ee8---23780624634.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/60549154077.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/85314319398.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607424497fa01---donedibatomafawu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8qr3s2pg1tfevj1mco5dca7toe/wijemamez.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/32578383504.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5863b84fadbf0672678c12d110c80aab/41148700841.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcab9415e3---86596908034.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210718132629126.pdfIn PDF document text
    • http://foodchemsino.com/d/files/sorudexux.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/76115148051.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/cbku4eu10mat4g528ch07h5s75/76955533371.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/bd121b9ddc06c9a4a349cf16f64423a1/68093271892.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/sokuju.pdfIn PDF document text
    • https://onlinendttraining.net/files/lapitirugajataf.pdfIn PDF document text
    • https://masukpt2.com/contents//files/pifulukarajez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=jazz+improvisation+bass+clef+pdfPDF 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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 11040 bytes
SHA-256: 4c3b02d614f647a1868af7af2550a8db60e6f180eb9622c2e63c12db221065ad
font_01_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 17956 bytes
SHA-256: 6f3cd702ffb1152111db44f629693bcc639ad4e4a0dd45c4aca4511de07d741a
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1