Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3b8f3d06e1095a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 06:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d114278cf982b3eed0d7bfd97704412 SHA-1: fc5f50105fb6ac792df704a5e0bb5bab2b0e4f8f SHA-256: 0b3b8f3d06e1095ac0e71ec9e6aaff7a653ee028d1d996417a48f4c4203919e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure point towards an attempt to exploit user trust via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=download+instagram+latest+version+apk+for+android PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/63390510723.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/kinavidumag.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/xudovitoluzirobogomosube.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/bc9c5d85bf8a6f1bd1d358be30b0f2af/70358167868.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/masezanow.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/3075184837.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c31e63775---wuxanokaletovijadumafiza.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/3611308955.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090722191270554.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/pezifi.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/jegawawogonexepagumipa.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/xabuzudixosetupuxivurilid.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/88765397812.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/77668636892.pdfIn PDF document text
    • http://ternovykh.ru/content/file/81679921576.pdfIn PDF document text
    • http://bresky.cz/res/file/64952614122.pdfIn PDF document text
    • http://lblussana.it/images/file/niborewujuzipasemolojes.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/tones.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/bukepunowo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef15e2b0fd---15570409556.pdfIn PDF document text
    • https://olterus.net/contents/files/98067161631.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/dasaseg.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_off0000c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 11088 bytes
SHA-256: 1ee1f852e17628d6f17367cae27e7712588bcddfe8c52ef0ecb5ac9acd440bf1
font_02_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 16772 bytes
SHA-256: 0c2d1e9f6bb17271c0aaa49ddaca2d85f33c123326690a65073c52160f176187