Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58f5c86ef1ac71a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 19:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0643c0476476b31dda64b44aafe37694 SHA-1: a02386f21e7d5c98a305d222fb04ec73142e990e SHA-256: f58f5c86ef1ac71ab725f2dc220bc6d17b66c8378fe23fcfc542ff78f6207493
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of multiple external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=notification+and+status+bar PDF link annotation
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/wojakagesawitexal.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://kor-ra.ru/UserFiles/file/38940465444.pdfIn PDF document text
    • http://odumakus.com/uploads/files/relofatadudujawotuju.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131d1fc1e073---17572056169.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb2c8503f---zonoxojarisuwun.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/33242806196.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/dupemesowub.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/jevirugub.pdfIn PDF document text
    • http://deauville.ru/files/file/57743286703.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/89r8gt4eebh3j0hgeg036j4a41/70884414209.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2tnaohjaebfk2avk27mgig69df/23598749264.pdfIn PDF document text
    • http://uteambio.com/upload/files/62292440818.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce291e0710---xegetenugukafaduri.pdfIn PDF document text
    • https://clubon.top/uploads/files/davapexemoxasuna.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326dae6348c---sasinotitoxem.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/91444678968.pdfIn PDF document text
    • https://vitanov.rs/files/7917447724.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/57221522125.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gesutevaba.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_off0000d0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 10508 bytes
SHA-256: d8302bbbab7cf3b1d99686c76eb00fb315bab520878025bc83a900136f3930be
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 17116 bytes
SHA-256: 94a2198f530cbf2143d1d6cd412b879659864a88390cf534f65fcd8a95de06c0

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