Malicious PDF — malware analysis report

Static analysis result for SHA-256 629ffc5f12126251…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 23:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5920bf0f723c69e4858a83d9c672ab0 SHA-1: ded3b37937f3cac09b8a88562e8f1bcd5a40e9df SHA-256: 629ffc5f121262518c553d395a4893aca56da867c44e77b3f9fa73e1b737bd76
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://augsburger-dartliga.de/uploads/file/85725348884.pdf In PDF document text
    • https://toskov-yordanov.com/userfiles/file/57140792618.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4fdf99b9f2c24f102a4f28d5bb58f1d5/xamubijazugogurogev.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c48a8881b---37156199334.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/34447d81adb07f80c5ccba15195cf56c/74556545206.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/gokexuresit.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/kopasalirokerigibedevo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/q0723v7cs42idj7ko01689u90n/74232344521.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/mazaxamusid.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086d41cd1848---58894519321.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/talunaz.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/363681631.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/11102223303.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/83d7f7a92ca4ce692cf949a85719bd41/86170822086.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/97798236589.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/wefawexupegaxusajuturi.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44256968133.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db762939ef4---35106731351.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2b7b102fbeb9e4149aafa832e11629df/99329474819.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3a6a9016---pewij.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841d8a3ba5f---21320273196.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c9989fe5374---xoximazujevelemaz.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/68401736233.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7df84840e---zumadaradoten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=philosophy+is+the+study+of+whatPDF 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_off0000bea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 15452 bytes
SHA-256: 9dc11a9ef841b0cfa262721377b84ad7c1ad42e14580a2bf1f0d51cef7889bd1
font_02_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 10692 bytes
SHA-256: d07635af3f0a85748ee9c9bb889aab38463cdb20307064099b176405c0470cb2