Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2a2e602b8d93c1…

MALICIOUS

PDF

89.3 KB Created: 2021-07-07 09:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aa3521c2c0b3ac3caecdc615673ffd10 SHA-1: 1b789e92a4b7d77efb8b3766183c2b7dadfdc6b5 SHA-256: 0a2a2e602b8d93c1f6ace2abba114d5d639f65087b36fb88c5a91d5ddf8ca74f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. The heuristic firings indicate a high likelihood of phishing or malware distribution, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=the+cell+alberts+pdf PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608947e01b7f1---42750509598.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/xujizizuku.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ofc5ccv6eircnm2516qu31m79r/rusobirafabudadesumuwi.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/90716349122.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d8db8ada97dc06f3e672e3782b5af856/nidekusix.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/41511972280.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/25556619816.pdfIn PDF document text
    • http://stylekd.ru/files/15491569429.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cl0mh7425kk3nl56eh4sg8qr75/terotopadefuxipaguxizi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4eb3f2cd80---bunedofutupujanup.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/38946462042.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u88q3cpra1jso3vk60kncq69su/44721619664.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092772d1698d---29759872915.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pegofurexuzujubuwumipe.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4b108d2afdf5be96df97305577c5044b/62799929873.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856f2c65c33---bavipoxumu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076d90c1d248---15374176367.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/67f1703c6480d40db4cc2a40bd9c558a/rukamak.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c2cac59bd17924d638c2ad0ed942fd46/kobekudenugid.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/87710549744.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893cd8962bf---metonede.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/db83e584bb3aa1565fd8957c0d51f456/61011159755.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_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 17872 bytes
SHA-256: 2173d08440f87995c59f4cb22c9e20c75cf760380f039ca1f4c63d61aac23749
font_01_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 10504 bytes
SHA-256: 88334ac7fa20370a9c07981710de355136469b61caaba4a376bc48d4d02893da

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