Malicious PDF — malware analysis report

Static analysis result for SHA-256 f801337ffb07ea79…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 22:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5f9d36a23e47f238dc8c7d51eec75d6 SHA-1: 4decce7cf7ffe35d25c05675f667211262d9a847 SHA-256: f801337ffb07ea79dd8eccab66c3e972a1b0df78cdf3f2a5f0eefb4cdaa1984f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous external URIs, including one with a 'utm_term' parameter, further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=android+telefonda+slayt+yapma+program%C4%B1 PDF link annotation
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/58515036112.pdfIn PDF document text
    • http://exim5.hu/_user/file/zolupe.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/30490211321.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/89924762422.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/bavukuso.pdfIn PDF document text
    • http://hiniceshine.com/upload/dozoxitinoza.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a64116b71---fenetasagivudidedaseji.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/3182579449.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8a2380a9---woxagajetopiwojatapuvon.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/jojak.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109061327034908.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304cdded061---zofejevu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/05a7256ab003de207bf91829eb0d5786/81884331784.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614414feac71a---sefoxavuxus.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/robufex.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/gamupew.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/danifitibisop.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/bikazegowokeb.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/21474750474.pdfIn PDF document text
    • http://thevalleytrader.com/files/rujebedilitelaxexenifo.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/71888249781.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/68899563205.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/aaa737a6090b9f9d24f17f4a5d3fff8e/mafajunevex.pdfIn PDF document text
    • http://primaneighbors.com/userimages/zatavomodobovawa.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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 10980 bytes
SHA-256: 1bdac3cd9198a15a2174bf74766f3934e47a785ecb35aeb1a8a1f80e6850dc33
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 18764 bytes
SHA-256: 3e673d8a2bb1882fa7065ead4eb8a7f1e36ca4ebc84a4107e5aefa805c40213c

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