Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fca5c06e353d78…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 08:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8feef5e8c25007820d656b00f08c3307 SHA-1: 1140377be4d515ac90eb9ecdade35ad678831f90 SHA-256: 85fca5c06e353d78d2edcf8b74db51b7423bd1037fb3531ffa281f76160dd4b7
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, some hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable security software, a common tactic to prevent detection of subsequent malicious actions. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://crysiq.ru/uplcv?utm_term=autodesk+autocad+2017+keygen+only PDF link annotation
    • http://paneldeconso.com/userfiles/file/vekepotavolubi.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/98394661601.pdfIn PDF document text
    • http://zzquansu.cn/d/files/dogejejapagoxejijew.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcebf54f24---vuwujipo.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/lejijulopesogamu.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/riboziwakatupinevoruk.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/gaxaridezonosotajozotarog.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/zimaruwalumematifovef.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/nokibawapopejojav.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/10410227216.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161401da0177b7---10328470226.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/jufajonufasowilasezexotan.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210914003630.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/95496461054.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/gavalolotij.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/76647586268.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/wedevetewomu.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/17273635985.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/febexabesibozabenorul.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/16169954332.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c54aeca04f6f20a376830cd7a63417e3/52429310481.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161433912aa270---begam.pdfIn PDF document text
    • https://panama4d.com/contents/files/rewonerejegerobuv.pdfIn PDF document text
    • http://jinyezi.cn/upload/zozineduril.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_off0000b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 10984 bytes
SHA-256: 3a4309b6e0c7b48f6b5f63e519c273020f92b122e382fbc89d4b9ec42a878587
font_02_sfnt_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 15940 bytes
SHA-256: f9f7f39a99c55ef7eef0ae0c6324679a9ac52bd8b63c16627630cee17e21bb15

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