Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c21ed8da01bd29e…

MALICIOUS

PDF

90.9 KB Created: 2021-08-14 14:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 059644158e961ee58558fe74c3ea03ff SHA-1: 7d789915b2e54eeb67f06ac8afed2ac096853979 SHA-256: 8c21ed8da01bd29e70f0d9f2c6deef3f0e09ed8e18d1b4a6f32b5bdc55378d7d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm. These links likely lead to further malicious content or phishing pages, aiming to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://irlanc.ru/uplcv?utm_term=android+7.1.1+frp+bypass+apk PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f00aa951af5e5f4bb85601967a4d6fbe/notosik.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/lavekogexeduzotew.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/saxarunafixiz.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/firugorededobepe.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/panak.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/mebuwed.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ekddsqiq5s308kcp6mpcfb89lp/zenazuk.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/10306294332.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/53d923d5755b8ff6ea150c8655df4eae/44217710058.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/dopanix.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/71507315533.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/87738e9a59c330b5e3ce2d131d3e43b7/44622031167.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/xikarawo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ae7638ff06491cd110fe00f6049b7f77/pisuralibape.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/tinoga.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/pasegiwitefudezeme.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/35605696169.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/muredolubowox.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/13002967913.pdfIn PDF document text
    • http://aweibel.com/Photo/file/vavasugopepimi.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/nalununomulobifam.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/norojekaxi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0515758cf2---20440150537.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703547dfc34---besovosopivabodiju.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/judozokefapoz.pdfIn PDF document text
    • http://bjjiffy.com/upload/23829264548.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_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 17920 bytes
SHA-256: bc1eb46f2c4da9d93124a06b877b87cafefe3060f2f341243978cc3b8f0263b6
font_01_sfnt_off00012bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD4 10712 bytes
SHA-256: 0a8f2c64593de6f30942df622a8167946d72fdffab9e0d36b17833d19af7446f
font_02_sfnt_off00014462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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