Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae2ae238ae20aa2…

MALICIOUS

PDF

130.2 KB Created: 2021-07-03 05:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 740ecdf823ab5c69c242caf2275554e2 SHA-1: 1dca9e10a8478aa497112b67ecfb554aadd16c1c SHA-256: 0ae2ae238ae20aa225fa8a91972343b10520ba605159f4fbc9c84b8926c11ddd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings suggest the PDF is intended to exploit vulnerabilities or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://smidgel.ru/uplcv?utm_term=introduction+to+applied+linear+algebra+pdf PDF link annotation
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2acm6bil2ldnq701d1ldd534dq/nobupovevajavezaru.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5cd4cea2fe6654e3bca5ba00975fa838/52727105050.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/ziripure.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/703bc93baabe09df390c78b9440d7aad/7786790370.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/gipifetirilenafitavapa.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/jakuwenisawikumukuxixov.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/67581080841.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf894bdff1d---76582779863.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/614a84f809f54e66ee34643229425dc5/13479375386.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/91177dedcf580072a7322ecfe268c25f/99423442850.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/05c32cb8df400e860ee7657d3fd4eafc/nugal.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9ce246b9a719b780da2862e253542123/nepuxanolukejonujivuj.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776d28060ed---29033600205.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/lunokelobosikufapi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/49a99921953bbaad0326bcd0a3de3af2/29977870251.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bcc7991b2---digomivupisawawudafe.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/2837f11137506bdaf29297c8289e46b8/gonawakiponataranebom.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/26858816529.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/p20hus2g9gensr9ge986rt7dl8/51772608522.pdfIn PDF document text
    • https://amblamy.ee/upload/file/farozu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7is3pkk6ug4li2ftud0tc9ulv6/silosozokakidip.pdfIn PDF document text
    • http://abwrva.com/uploads/files/32228724603.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7c2d2566---kimakabovudolezigag.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6d156a13---17365753917.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E9B 20440 bytes
SHA-256: f4eae67870938148005e21056440bba3449dd3cd5be5af1b4de87b3867637c8f
font_01_sfnt_off0001b452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC63 16196 bytes
SHA-256: 462a4783e98b38620ac8f8ecdcd5a68537a1a8a2bd0fe099007260b825b6a7dd
font_03_sfnt_off0001e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1EB 10820 bytes
SHA-256: 7f3b7614ad3924255fca220468f2637428f40347d394fe2645edfcace1d4abcb

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