Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c2c6458f9dc4c6…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 21:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb90936e0d40fa8fec3028bd0f659e1c SHA-1: 9e9f340dcbcb7ae34fb2e70ff1ab046bcc17e315 SHA-256: 17c2c6458f9dc4c6244342d9b689701b52b91630de64ddffccfe83da2621077f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 http://vpecargo.com/userfiles/file/diriludemojexiwi.pdf In PDF document text
    • https://gastriklandsbf.se/UserFiles/files/74690942769.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/6979401262.pdfIn PDF document text
    • http://lgassociates.in/uploads/bilozonudip.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/58735351836.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/birevogavukefajenaje.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/kezedewi.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/66604558138.pdfIn PDF document text
    • https://westech.solar-napkollektor.hu/js/ckfinder/userfiles/files/13434666770.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/40223814116.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/958d9af3866ece6e64ab8d368dc40b59/dijadojugoxi.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/63573865383.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/8473797473.pdfIn PDF document text
    • http://ahknchem.com/upload/files/kanipewirifimumasolapi.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/gutamovutu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe3257202.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/xinumopudufakirufufefiz.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/465f81ac4841380e7214677c6bd4c6e8/sudikamoz.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/83922484513.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/kebukasonuzoxasalejirirub.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/fofadaloxexipuviwo.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/tebaxefaxugejisotezig.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/lonaxogawixutegunuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=stop+call+waiting+androidPDF link annotation
    • 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_off0000aef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF6 15312 bytes
SHA-256: c15fa0802f3d08ae6da7d7893e8463920c270d75ce5a943d87659d0a35337473
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 10548 bytes
SHA-256: 1026fb90a2300a140d50ae0b98933690631589f242f85820ea74e423686a0062
font_02_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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