Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a12a811ab701eb…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 21:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b7e64b331f3b4e2f68bec6002e40ce25 SHA-1: 19a869f98ea957c70a72c6d2ee8566b3b1f7fffd SHA-256: a6a12a811ab701eb44aca0db319faace33f97d4b55a7aa8e1325431a38177a15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The 'utm_term' parameter in one URL indicates a lure related to 'minecraft update 2021 apk', aiming to attract users interested in gaming. ClamAV and ML classifiers also flagged this PDF as malicious, with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=minecraft+update+2021+apk PDF link annotation
    • https://groupburuemas1.com/contents/files/wenibovumavugusi.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/28183987632.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/23056411145.pdfIn PDF document text
    • https://alariel.be/userfiles/file/80009966715.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/bofebebumuk.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/vosesinowowarumofog.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/74141264839.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb393ef3d8---doroganafunapakepon.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/39406874357.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/74219444972.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e28e8991ca75f8a0e38f866ff7581574/66326967753.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/vunawirifajo.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/jexudiwe.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1c3886f98d5d18a66004d8068d57fff4/debuxudogikosumexuzeve.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/6346191925.pdfIn PDF document text
    • http://konberdbio.com/upload/files/kevoluduba.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/senubakotider.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/wetobigavaguvopinatuzifag.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/falegafekejaduz.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xopoxujagezumekiwidexi.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/fimodizutagavidagoga.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/10157404982.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/milimomisafetuxexovunar.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613f440350339---19968281643.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/lepolotixokeboz.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_off0000c458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC458 10760 bytes
SHA-256: 8113471b149c9b24a3158f4ee95f28aad4bef0b34bf00f823a4926b4256cf516
font_01_sfnt_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 16092 bytes
SHA-256: 944543740fb65786b5c8e7dfa4a8e36ddd8e368937f41fd7fc5a518028dcc7ce
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1