Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeecfe2ce500f387…

MALICIOUS

PDF

82.3 KB Created: 2021-09-24 03:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ffeee2472431e2f038c5e26109ba9d34 SHA-1: 221b1ec0e291314ae466d64b47e7b015382d0a7b SHA-256: aeecfe2ce500f3879fa6a46fc09b4cdb75d5b267855ad94184ae0467f840216e
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document is designed to trick users into believing they are handling a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=anti+android+network+toolkit PDF link annotation
    • https://daqing-jewelry.com/uploads/files/202109070509594586.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/64805320124.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be16508364---wavetegoneno.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/nutewik.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/41085171586.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/sopumal.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/31309949359.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/dafowijutapurebewisu.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/zaziposawotutuz.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/39730998418.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/66815837686.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/529cc3e1ea2b8d0b496e7a7cd137ec09/retibevugodo.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/3159946331.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/12569473569.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zunavopovisu.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zonutozo.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/zuvejoxiboxakiwukop.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/81323652038.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/43851044349.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/dejifezas.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/30405087457.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/11169352956.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/dadeza.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/25107708749.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16139b39f5a8b4---wizazoxiborup.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_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 18828 bytes
SHA-256: 941d19199efc8029c6bc5775ad3af2f969bb450642eff1d37e37dee3bad1c093
font_01_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 10232 bytes
SHA-256: 556b23711981109b6928ead7731a0ec6aec9d584e6f345ecf0cd14f0fdab0ce4
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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