Malicious PDF — malware analysis report

Static analysis result for SHA-256 61535c5ce1466e39…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 07:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f0c995a2413991d6d0148637455cb9d SHA-1: 566f7f3502e5ec17af6760360a6f0338d81a57b3 SHA-256: 61535c5ce1466e394154d7082f5a4a50843d1a70dee9f3e9c9a1976802461fb6
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or SEO poisoning attack pattern. No scripts were extracted, but the overall structure points to a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://marjoleintje.nl/include/userfiles/zitokopiwuzizuvatatalu.pdf In PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/40234069994.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/39476534189.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/jireb.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/973op0qp999bn99d6nm1ar8a35/sebobologepa.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/21712146333.pdfIn PDF document text
    • http://berbun.com/user_img/file/44710119923.pdfIn PDF document text
    • https://papiratisk.cz/soubory/48314257951.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614804a77f873---zofutibuwijaze.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/18831796412.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/sagika.pdfIn PDF document text
    • http://iucecb.com/files/file/jadofofena.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/vudokewefegobutoziwo.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/73725128006.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/pogur.pdfIn PDF document text
    • https://adikkedua.com/contents/files/53593886347.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/73071437877.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/jebapaxobidemavamabejiz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jk7sqomg4mah17v38vspg1ptkp/97621454425.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/43878585259.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/bonafori.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/64630072540.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24668994370.pdfIn PDF document text
    • http://eternaseguros.net/files/files/79141531038.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/garusuwusag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=transformation+of+sentencesPDF 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_off0000cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 10416 bytes
SHA-256: cc0ac48d27463300c2473781eec7b1670690b4ad8f58c3bc4137e976a5be5aee
font_01_sfnt_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 17324 bytes
SHA-256: d56a306f9a10c0a51364b2f25fa420ac388df9a6b84edcd2377ccf24c6787217

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