Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2d4dd1b155d985…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 16:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 122f2c1d8be4a2e7a3b9c7858e2093c2 SHA-1: 22ca302b13d0b62e78cad6ae3cb0b0dc77ff306c SHA-256: 7d2d4dd1b155d985039d34011359dd83d0648602df3845de013793bae7513168
156 Risk Score

Malware Insights

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

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, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://fishngrill.iorderfoods.com/uploads/files/50857062913.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374b5fd8f09---tukakedusodi.pdf
    • https://giriconsultancy.com/content_files/files/13825737650.pdf
    • https://comtraining.cl/userfiles/files/sixesi.pdf
    • https://ksdc.in/userfiles/file/12084871649.pdf
    • https://tomorrowhubs.com/upload/users/files/zexinaviwexogiposowuku.pdf
    • https://markaoyun.com/calisma2/files/uploads/95640454337.pdf
    • http://tokstar.com/_UploadFile/Images/file/86315714423.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457dc2b3898---jejapamigodarube.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/lctskcvjlt2fdm4ai2bajs0mom/suvesaz.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/wusisajoxizoxiseb.pdf
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/xofimanaxorujalojaze.pdf
    • https://adikkeempat.com/contents/files/govunuvenodorifenow.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/32973279286.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/nizitefalaxefodozumilipi.pdf
    • http://oilmachineydy.com/d/files/piruxozitipuna.pdf
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/87993832776.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/rozipilafemiluvirul.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/jupopewapajudowaxe.pdf
    • http://nature-revive.org/files/file/11540116027.pdf
    • http://ozdermusavirlik.net/userfiles/file/podirugavuduvew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=itunes+gift+card+codes+unused+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a8.bin
2fcb395a7c6a5b03406fa6b262e100d38afe54da5e5da7e1e7cfdfcc5cb8f73a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A8 16192 bytes
font_01_sfnt_off0000d99a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 16792 bytes
font_02_sfnt_off0000f1b1.bin
4d8505c8d9f691381e9989867d724a148f7e9e1e3a6a35610a498fe83e261e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 10948 bytes

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