Malicious PDF — malware analysis report

Static analysis result for SHA-256 c390a7d1652dce3b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 03:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1987deaa5340a0f8bd10f29cdad6f640 SHA-1: 59681ac67e0400ee728e730501ccf250749fa467 SHA-256: c390a7d1652dce3b2dcb1664aa9c87d288566e7892c7eda2a27d603a9d4e1cd0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

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 https://synerhu.ru/uplcv?utm_term=cinema+app+on+firestick+2021 PDF link annotation
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/sidukejonim.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/vikinadefa.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/52188060189.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/zoxagibazovakujikukosego.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bokuvosexibivuki.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/wemobedosegekefos.pdfIn PDF document text
    • http://keramann.ru/uploads/files/74043539780.pdfIn PDF document text
    • http://hkacca.com/userfiles/vonelinem.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/81742221901.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/04155557a2adc21023a84e0a9f6b6629/12552734872.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/52848825057.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/dolev.pdfIn PDF document text
    • http://hotstamping.pl/files/file/92597164083.pdfIn PDF document text
    • https://allianztc.ro/files/file/94970922186.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/65754239781.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/ronolixuworogule.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/1161423052.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r3q84q9ar5b8p2vgn4dqvd1gqv/xolenonirov.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/jebesurosenafanifa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3f953f5f---lezolizunidikupodemo.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/12123887708.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/49784672723.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/fizikibabozejimi.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/sarevuzukubimabikuderu.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_off0000d3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BA 17700 bytes
SHA-256: b767e8fb2f69a2ebd057e186414f8fe8414d2ccad2fa2a365e34315c8ab41b38
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 11012 bytes
SHA-256: 69c13600d9f93966a77b1ca8172393e0d0a92b133d8b594ea41ef725980e3f25