Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edaa828ab107c29…

MALICIOUS

PDF

81.9 KB Created: 2021-08-10 13:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7ac5439e4e26b2810b9da031240dda3 SHA-1: aa8956e7a7e48b9f6c5d72c5d705ae38d0d50571 SHA-256: 3edaa828ab107c29d1f51969a4ac82aec5a42f814c7d6cf812c6dd670bf2cfa0
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further exploitation. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alatheir.com/atheirwsfiles/file/levofuwanivixetisodebave.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05fd27ef6---70919291654.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/52366240366.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/68168664056.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9347939f3e399aa060a224b8481cdfb6/26939420184.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/savugitojimepanujijuta.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/kifojutajisovo.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/potemiru.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/96033197119.pdfIn PDF document text
    • https://isleo.com/i_photos/file/59771221191.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/durorivobavowasofaziruda.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e9d063af38065aea6e67538694f0edfd/81358506614.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090450f21531---17469985838.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f4bf71a1ffafe7336f64529eb5c4c033/57310792507.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/90061856616.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/mezuzomerakedazodefarape.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/46176358056.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/tiperuwosakawobali.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vovutukalujomemiwesavixok.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/11971793516.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/sosomosajeka.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/10030371375.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/089e0e77fc16abb2225bb9f4785440bf/66726327496.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/kalibemema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=audio+spectrum+after+effects+cs6PDF 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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 17996 bytes
SHA-256: 32080da6c7a1cb443964153711d7f34659592d82502c8f9785c7af7bec425801
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10880 bytes
SHA-256: 909934dcb1afce56adcfbad39391f42ae4ac55f6c519b50765f06df4a981e717
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1