Malicious PDF — malware analysis report

Static analysis result for SHA-256 a169790ba9e96854…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 21:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c35b4e1455e017e33b625250a2f9a3f SHA-1: ef4772e59d20f3c7f83abac57376ca3cb17ad54c SHA-256: a169790ba9e96854f9f9f443f71b625f10c47b6660c048ac800042e579f3694d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, including those hosted on compromised WordPress sites and disposable domains, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=picasso+android+tutorial PDF link annotation
    • https://suksesunited.com/contents/files/33921720979.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/24058975614.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zuzatav.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/wokojat.pdfIn PDF document text
    • https://kenadong.com/contents/files/27815530649.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/xininumu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7c2a4c76313a877dced962d8e32625f8/rotolutaluworipuwepakin.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61431dbdd0daf.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308acf9f233---parevefesakemi.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/33489192668.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/26453153797.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/besixu.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/fuduzus.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wugafovirupigufapozip.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614160e4efc19---20237656049.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/86818980841.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/viboxumamulorib.pdfIn PDF document text
    • https://tdfstore.it/file/vurodelal.pdfIn PDF document text
    • 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_off0000cbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBED 10332 bytes
SHA-256: 3be967a3e3f33575719c31b0980edfe57d94b689658fb881f8ceebdcafde840a
font_01_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 18752 bytes
SHA-256: 34f791161c0c265c9ff449d9ab30bd90c7c8d777b4134ff0e3d70a1f1cb56509
font_02_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1