Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3dd060d5056093…

MALICIOUS

PDF

72.8 KB Created: 2021-09-08 04:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4d4cc8a238c8d6f74921db598abec07 SHA-1: 35ec21e46eed03daf810521140f4a1303f8a6591 SHA-256: 7f3dd060d50560933db31f24193d256032a0236a2d7276a3ee745fbb6a1ac1e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. This suggests the PDF is intended to lure users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://rm-centr.ru/uploads/file/36405806300.pdf In PDF document text
    • https://krono-original.vn/Images_upload/files/91911575815.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/84280758085.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c2806c15919ffbe75a56383dfd079ff0/53400323263.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/75751088064.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/bemobafagituri.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4trgvo55ns4jknofh7ju10gsre/22928116348.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2143ec53---xaloranijigapit.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/53129544208.pdfIn PDF document text
    • http://reylab.com/userfiles/file/mezunaf.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/vumefifapakeguneg.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/58857407859.pdfIn PDF document text
    • https://bursac.net/userfiles/file/5891561163.pdfIn PDF document text
    • http://hydrem.ru/images/file/35524530510.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210507141446772038414.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/71427959980.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66e20833d---rukosojoladajigas.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/64190063414.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/79904077333.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0u9sin1iqqt89b53gh9nlcjc8g/88361759303.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5162622773---guxifelozuwexipomowej.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16116fc2124495---13199624904.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/87925200017.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/65f1af8fcb346ef4ec4ce35f8b4fc659/supubesosodukanuzoxe.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8113eeb14---gegamajudobakateserasuwab.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/nobavudenatewofagubadoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=toni+morrison+jazz+pdf+free+downloadPDF 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_off0000b9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BC 10800 bytes
SHA-256: 20b543aa108e1c93ae84430cdead8fda3cc0ec4f38bfd3f40befc4e5d6239b3e
font_01_sfnt_off0000d2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A0 16312 bytes
SHA-256: 091d038683dd106a569714d17074bbacb1cb71524665e1feb2fbf6486f582f53
font_02_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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