Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c9aaeda3095da7…

MALICIOUS

PDF

76.4 KB Created: 2021-05-02 04:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2f7fdb994113a6b38cf54b21f8d4c1a SHA-1: dcaa31b1db1a5c2e57999f3233ea4abf1a77d397 SHA-256: 55c9aaeda3095da700818a9cce36be6e44fec4b918be2dcbaeef3bd8a0bc01ff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to photography guides, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://alibabashipping.com/userfiles/file/guboken.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175f7b5417---97510561635.pdf
    • http://akicgiyim.com/userfiles/file/xuvowiti.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c373fdb76b97ab385a443e0753a2f55e/siteb.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d568e9aa92---46481477990.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5cf2cc5c89ccb2961a360626f5967baa/duxofowawuzamogav.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072e380d487d---nozubiradebo.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4d260c2cc3a08db36210b6189d87dab0/tonowawejopadi.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bdd093bfe54c8479567eb62fa129527b/wufozejifuxal.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/gh26bu4aofpdbd9g4kafnoar74/6533091752.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/46d15ea945c9e6645419f161d28b7bed/fovuvimuxunenigi.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/995a4d4686a97ad3fc51e19679f6f7a6/57536897096.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1df9455aa981a17fee6572573eab200e/gajote.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb885c7d7---28400316993.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607679cc18a82---gomilirotapivudojodedujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nikon+dental+photography+guide+pdf
    • 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_off0000f024.bin
514ef38bf181ff48986b0830e685060daa566eedd14c1e3a242216b65509b3b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 5260 bytes
font_01_sfnt_off00010216.bin
ab5faa9be4d7e818d61d90d1fbd8ff844d50946bfeac1bbbc75a5a787bd85793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 10132 bytes

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