Malicious PDF — malware analysis report

Static analysis result for SHA-256 299a4ec213ee2455…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 18:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0be8dc74adec1b66ea795a9e1d0f47cb SHA-1: 6234c212dd77b65a574c39d5c5a7b12864588bec SHA-256: 299a4ec213ee2455656fc48e81eb083f7fd6affefbe689521f9985971d3d806f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to external sites, potentially for phishing or malware delivery, as suggested by the 'link farm' and 'phishing' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://edu-family72.ru/content/images/uploads/file/xidopanodunijidepamu.pdf In PDF document text
    • https://shunnasato.com/nulige.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/90250073550.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/liwanegomexitumenitolijo.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/lorovepenutuvunatokasul.pdfIn PDF document text
    • https://ebooksweb.net/files/file/tumexoninifep.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/67639749420.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648a6e8637---rojujogijavara.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3c00646fc98d14b63687fadc482a39a2/99823676698.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/keteguwugesunozimajemamo.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/volazudafinuzesibisotadik.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/28822191899.pdfIn PDF document text
    • http://unseretochter.ch/images/file/meposekuxegemuxif.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/wubudidumobezapes.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/xefatimutijezu.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/89432292162.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/83574cd788e286d6511306769ae89172/38100341303.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/gulidon.pdfIn PDF document text
    • http://rhondachem.com/d/files/57043837902.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/54408488631.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/famixevezobobiru.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/73540897002.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161339f5e58225---vurifumu.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/wekefeje.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413bee354a2---95071623393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+walking+dead+season+9+episode+2+watch+onlinePDF 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_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 17104 bytes
SHA-256: e55ee415490d1065ae5002f6aa7dcbc81eba98ec31b57421897242bdf780554d
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 11124 bytes
SHA-256: a05105f3bc83724ff4c572cfc86102a71b14f9cf5a7ff4b8f2170f07728fb10b

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