Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecac286cfcbf8fd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 13:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd06bfef637c33a8ffdbf1e4532c2a60 SHA-1: 405ed3611cb2bff21a6591ac8de4d02fa7e0f256 SHA-256: eecac286cfcbf8fdbf302d5772c7b35be9191d877f74a4f6048307c473d7d75a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, many of which are designed to host further malicious content or redirect to download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple PDF files hosted on various domains indicate a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aurastaffing.es/upload/file/dosunofobaj.pdf In PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/49003785974.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/16659971764.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/96422014112.pdfIn PDF document text
    • http://ifap.it/images/file/99224190999.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/44693853151.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/93422995099.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/97026208400.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/dabajapusupofili.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/bodugesitisunipope.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/buxarulikobejuborof.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zinofule.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/75398661220.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c718c6c8ad62d2119297c87a97941e40/dakukebijasigawelegaxufu.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nadozobutagiwegape.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/genodutiridotilibux.pdfIn PDF document text
    • https://terracell.pt/images/file/65371976027.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6c4d9fd0f3663825087924b21debb557/2669551337.pdfIn PDF document text
    • https://eternalbliss.net/file/99267323257.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135c95241faa---81262567999.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/pogujasenedovikur.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/1012423832.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614834db49562---bolafa.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/buwanupitebewuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+diablo+immortal+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_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 17064 bytes
SHA-256: 3bb09c276fcd49322ca38bb68934d95e5c4d55d21723815e8d62d054c3f09268
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 10572 bytes
SHA-256: 02c7b45d2b15b2ef8846ab516df422c2291164a6ebc0bc21003440239233577b
font_02_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1