Malicious PDF — malware analysis report

Static analysis result for SHA-256 1958fdc0f23263df…

MALICIOUS

PDF

98.4 KB Created: 2021-10-10 13:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b16adca132bdcee13e2f25cc5083b16d SHA-1: 34806ce5d510660f25abed5596bcffa87597cf92 SHA-256: 1958fdc0f23263df9f8568de9db485a939213fb66c69852acd49758d52eed952
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://atiksigorta.com/files/jefalujeli.pdf In PDF document text
    • http://landia-print.com/pdir/file/rowodunebexonumas.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/62992750374.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/guvanudoxokovinojoj.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/24245040263.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/gezaxuj.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161605e952e06f---bosopuxan.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142336338bd7---97591912260.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xovaw.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/lafutiseve.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/354500359.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/bofed.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/borunujofanewel.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/sabasewasafewuwonazal.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebee56a284---sabezajemanetojigame.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210917181326.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xezavukebip.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/30213523965.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/nomuwozabawafa.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/62348591887.pdfIn PDF document text
    • https://obrbikes.com/files/files/72999917202.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/bubojurisobitin.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f8c10e3e84181e4eaa7de755c6546fe9/vamatigukaxima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=using+chain+rule+to+find+derivativePDF 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_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 10928 bytes
SHA-256: 2035bf429a993eb92ebeee061e9cf45c6bf72135280fdb3a73e6c6a93141a26a
font_01_sfnt_off00012d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14531 20652 bytes
SHA-256: 0a9da31aa851ed028caf429ab8ba85d6b6b4026c2ff2a1b6dfae5920a7b5dcf4