Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e8f015809f8d29…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 07:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92cb4d68a08110c073adb708387de440 SHA-1: 2c376df12bdc464855dc1bbabfde4098d226cda6 SHA-256: b5e8f015809f8d2976a01cf214c0c7ba2f6e966bf3b9b7375e678702230ecb33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a payment redirection lure. The PDF contains numerous links to external websites, some of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://millionsdiscount.com/mo_images/files/65096146035.pdf In PDF document text
    • https://art-gallery.mn/uploads/files/vabikater.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/85444564475.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/papugenobifota.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/83619265749.pdfIn PDF document text
    • https://costarica4d.com/contents/files/77743091475.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/bexajagur.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/kamamovusovirurofonokabuk.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edba46ecfe---wumisege.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/50486418412.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/fiwuw.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3uq3qv68qhg552l0cg8e2s0nt1/10467082347.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/riguwewozilenolilaloxep.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/farajivujuvotanofepuvo.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/jifozibijijafuso.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/napodotujodikin.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/58656156383.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/14638355965.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b5ea47ba8eac1312f9cb2b11ec3e8c21/jotavo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ff4a3034d3c38e3cf5728c187839e472/kalopinu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ac149a9d---96273939833.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/56073525178.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/7399163462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+transfer+your+contacts+from+android+to+iphonePDF 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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 11132 bytes
SHA-256: e53c07f2d670b37936b94ebd81902f69c98e15ac8eb7f2eee0e62e589a9eec6e
font_02_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 17324 bytes
SHA-256: 4a9c492dcbd1c8abdc520299ab3135c76326e29220c3da81c8fa99377a42017d

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