Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece59cb94ef31858…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 15:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4943510d90ae7c998d2ed383a0ec1df SHA-1: 24ea88d3ebea95d73921d69a8cc649b9ef7f9994 SHA-256: ece59cb94ef3185866b66841bd5a224b958650ad0756ae9e96cf8d99425cbce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, potentially to spread malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=android+cleaner+app+source+code PDF link annotation
    • http://enewind.com/pliki/file/51495020636.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/18391810663.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/kaxosefevulujosavuvafax.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/tuverajek.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/40465909416.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/36197992590.pdfIn PDF document text
    • https://panama4d.com/contents/files/pofigofirimajiredobive.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/90558567966.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161487293e1499---3856781378.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/52946807989.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/kejuvopowizajupe.pdfIn PDF document text
    • http://sjhtractor.com/d/files/71149591210.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/xupazogadegevelufo.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/1885280913.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/rorugemexaredojarakaduxen.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/vexutuxojofiwibo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j01rdandtmq94o97p3ab220sk4/20793911730.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146948d9933d---mawobimirowujo.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/53457114759.pdfIn PDF document text
    • https://badrivishal.com/media/lizogugilafebonerofosuz.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/tunikexetemelifedezap.pdfIn PDF document text
    • http://accronline.com/userfiles/file/bimipejuvap.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/2740677402.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/jevejapopujeb.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/pizefegivozitofapojug.pdfIn PDF document text
    • http://techmechengineers.com/uploads/ramumuwe.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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 10488 bytes
SHA-256: 68f5a222cd538eb4f5b34bf112ff195ba97bf015f2152beeb03c0a2db798f962
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 18592 bytes
SHA-256: ffeba09a36bac28d18c1f4ab3c3bb67515bd160d3ddce762593bd75855c1e34c
font_02_sfnt_off0001245e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1