Malicious PDF — malware analysis report

Static analysis result for SHA-256 2659241d135aad6f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 07:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0060ee870657d6da752e900729f41424 SHA-1: cae31533d9607d7abdd3b005db3758bf1931a9e5 SHA-256: 2659241d135aad6f45e48c9498b70c277e52f0028e41c6e71a1683f3df8332e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5f3e0f8ce1e6e69f96394114c73e7ba/84625160166.pdf In PDF document text
    • http://forter.vn/hinhanh/file/xojelofatenowoj.pdfIn PDF document text
    • http://rotang.net/userfiles/file/xeruxitos.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9bcb8c01---famidaxixopusepozize.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/rarataximewerozanojuxu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/nsobv7cidmhkagjg2463tgssh7/19674398416.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/sotedawomunix.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/bovegoralibodemo.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/64857096051.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/95625787410.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/94515007608.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/guzosojudurarifijapinewe.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/77746897180.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/wagutul.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/mixosa.pdfIn PDF document text
    • http://sooclose.eu/upload/File/32245936333.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/filunu.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/74497683807.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/23564078372.pdfIn PDF document text
    • http://brlairport.com/images/file/winenujulenaba.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/sakagixodut.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613907839d85a---lujaxatilenosuna.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210904050439088.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/14536537930.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/15946190592.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/nijaxitaroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=win+xp+simulator+apkPDF 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_off0000b647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB647 18224 bytes
SHA-256: 8b3e3f05e80402abc4f7faf56c86fbb40b7b4f4e88ce43cf731fd5714015d538
font_01_sfnt_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 10568 bytes
SHA-256: 562eaedf77d3444918f81c7a4d931c841854b0ab5a13c691f244091da96da5c9
font_02_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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