Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dab7f332ccfec9…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 03:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f8c4bf1fe255f72b4fdf3e3312799ae SHA-1: a7b54f9c1ba5f79129b789206c64921a6d3f15af SHA-256: 21dab7f332ccfec90f18cf6e38a0829272516e153ae0799175b5ae1a04ceb96a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://artospace.com/pics/file/39304207159.pdf In PDF document text
    • http://ztkammer.at/uploads/file/23978145832.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/33014851647.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/bisigokimitazusuwegigega.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/tisit.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/08/file/20210908_135158_181.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161341f1de19bb---27640849928.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/69250765010.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jikodagajorute.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/19418189272.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143db4fc2903---61308770404.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/11914467374.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/29093104238.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/44473644335.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/gasobevakig.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c238edfdca8db3cf146a0a51aff28ed0/45653902706.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/korafevoluxasulu.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tavotavokenimuzikozuri.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/titalajaziwotef.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vurakotu.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/88538777790.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/28089585331.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/20057804360.pdfIn PDF document text
    • http://kco.su/userfiles/file/ruvowenumexal.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/95937622312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+find+deleted+videos+on+your+phonePDF 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_off0000b177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB177 10788 bytes
SHA-256: 1c8f97c45a5c9cb5a2691a60428cb42d84e8fec356cf3b1791eea550d852764a
font_01_sfnt_off0000ca42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 15336 bytes
SHA-256: dc352b3990ddd6ca648552bc84eafb8f15cfd38dbf5a7fb12adb2a066ca74965
font_02_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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