Malicious PDF — malware analysis report

Static analysis result for SHA-256 160a5345e598ca99…

MALICIOUS

PDF

72.8 KB Created: 2021-05-26 15:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23d0c7e1c71fd67b501610e5b0831f6f SHA-1: 6029974f568bf4b530c7319433256e105d37bf56 SHA-256: 160a5345e598ca992c4c353e4b204ad8db45806d9e167eee85f9f2e844b644a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/8357149919.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/237ff6e69d79a1e34b109236c7965583/jokos.pdf
    • https://echipamente-scule.ro/userfiles/file/99505265691.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a661a7bf1e1---jupofagejom.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160712065ed01d---38712521005.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0ab593be---2601510737.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a6216652e1---63771177938.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e8efed6821684a13fa3ebed8429660c8/68392739089.pdf
    • https://aterhesseg.com/up_image/file/22637249966.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609625eedfaee---levogofopadusemowifopob.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1fad52ee2c46b00e37c6af25d76256be/libulugeveredatu.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81721d4aa---3050133465.pdf
    • http://citra.cl/userfiles/file/7986721743.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b70ce6b3a738a42dc1d39e47ea0ca75d/todepeborozore.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4c37c294b99814d5ebb35602a6540a76/piridabuxudenalemivo.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758aa3c5bb7---76692489887.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a50408fd---18789790776.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/rg0v5capreme7jh9ht0ceekpgp/vufevajoduwezuzoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+hook+up+wonderwall+projector+to+tv
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e001.bin
b03255c970586886d1762b48fbe5adedd0f09e2f8a36f68f4c35c5afa4023810
pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 5236 bytes
font_01_sfnt_off0000f1e5.bin
adc8f715c82aa1f0086f713a14422f8de585dc2e170376b0bc5a71f76ddfeb10
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 10424 bytes