Malicious PDF — malware analysis report

Static analysis result for SHA-256 c065d69bc587d08b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-14 09:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b59d15f6f848216e5bdd7412d68ac99d SHA-1: a1c0436f3710292a0abefa9918ce59ba5c6de47b SHA-256: c065d69bc587d08b14b5862a149447c76a76e0674b119f02a5cd4b5b6f730fba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://minhledtran.com/luutru/files/kekerirafigugofopatoz.pdf In PDF document text
    • http://tcgardening.com/userfiles/file/2021090120054673499.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/53639586729.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/73914082350.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c533471e8504232d3868bd6bb5a9d986/14328804020.pdfIn PDF document text
    • http://freeorden.com/media/file/79306175090.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/93652474833.pdfIn PDF document text
    • http://belovosushi.ru/files/56986819116.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/51963875212.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/87973559706.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/6770272266.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/logez.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/18328600987.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/68861166688.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9719404e1275c9b70b139d0b586f7e81/49042447655.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/fc178747n74f0asdh4792ro4u3/28440556015.pdfIn PDF document text
    • http://feg.vn/uploads/files/20844835648.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/13122332346.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef6393479---pukefadut.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/88843257103.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/digopozabomib.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210901080829-senunarexu.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/30856212126.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/10976861619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=clickup+for+androidPDF 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_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10436 bytes
SHA-256: 06f6ce25ab4ab318526165c9af82091e427ba244d40778f75a6439ff4ed2014a
font_01_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 17752 bytes
SHA-256: e35d51e5320240459ce97eba3d22193d29bfce09c056a9c8cbe99d66f3504c8d
font_02_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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