Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3da25a48fc33664…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 14:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e4b8ede1984b5384c492bc2fca94e55c SHA-1: 37280b8f100bef75620f81c921018190826dc996 SHA-256: e3da25a48fc3366486f14ff0c3e0989536434a309c80a7b59ed60f2690da31c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis confirm the document's role in directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://queure.ru/uplcv?utm_term=greennet+vpn+mod+apk PDF link annotation
    • https://thuaphatlaihoanghuy.com/uploads/files/tuxexubefotudomukiburugak.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/mazozazufenufefaxo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wipilagezigeko.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/68653247137.pdfIn PDF document text
    • http://roocenter.ru/upload/file/pubekukabi.pdfIn PDF document text
    • http://lex.tj/img/file/93553289119.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/33533309213.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/4574389775.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/50662991569.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/1298693661.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870d7a121a---jovumukonabesududuwela.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/8444592700.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161409259842a1---25496140892.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/67332638599.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/notubevixaserizivode.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/37248185619.pdfIn PDF document text
    • http://houselandia.ru/files/vidaxigemedalufemonibuvo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147a8d215263---9791828389.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc91ec52f0---wezawozovebizitevepidow.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8a21639ccc9fb94271a6033d17e619ba/ludatifuzevirafowa.pdfIn PDF document text
    • https://rintrans.com/files/dikivupezateged.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/julujuzemomalijedakoni.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_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 10444 bytes
SHA-256: c69c71996f7095c80d8d4f066fc0df34b3b1d9ccc2dfa282d8eac45aefe97538
font_01_sfnt_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 18180 bytes
SHA-256: ae8ae653b6b74473123b7f5224b5acf2ff8ca075b15044d5bf11c14ecd6f7385