Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3506b376c8da80…

MALICIOUS

PDF

105.6 KB Created: 2021-07-08 01:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e46656a8b0f7a1831674815853ae77f1 SHA-1: 8f219d2ec1cb927006e38a9af9cc47f911f78d4a SHA-256: 4d3506b376c8da8002da7cef85b8a0943f327a262a35dbd2b082d73461446c9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://szpk.hu/_user/file/24107895519.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ntgqoud2nv3m5n7ro3send48rc/18281617025.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e0452a15ade9addf7360ba92a155abd4/21458723797.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b4d3050a8---51917740609.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/xomapezubuz.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/oosc26o5vvt7prrpcglb2586e1/kubirivemif.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9b0512b0---sigafegajato.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/bitojuposutuj.pdfIn PDF document text
    • http://cy2hand.com/userfiles/kakopepag.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ba70a97d700cafa8ec86b7d419ce763d/74373031045.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/fonefozavepalaxe.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/lujufabesatarakesed.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e52f413c9---9275303379.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/kubodanegobujiwoxos.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/vevifilururapilulapo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4127ccde95---geresilafumidevidulusam.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/72413986320.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/nuparata.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6b0da5a0---pajufokanupoviz.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5vigviuh4353ismqg0k95ehmhn/bibij.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/86095326523.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a276875b0---mejomizotubaki.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/butgv3f8do4aisep061433qr29/dekajorisotosebolaki.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/rogik.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c40464922c4---ravodazorejoxebigivoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=perfect+dark+mouse+and+keyboardPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 17884 bytes
SHA-256: 173568716916c6c8c78512d48bace7d53772606779bc737b87755fcbbe5f07ee
font_01_sfnt_off00015171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15171 10948 bytes
SHA-256: 5d79df82e7d23b3b4d43713432408bb7f94b40b25baa91a1b3d8112404816475
font_02_sfnt_off00016aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEE 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00018064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1