Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cba4db209e4e0d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 02:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d33068b168920a72d6ad52b73666d956 SHA-1: 128b5e4799f836b8d504b9ccdff7fdff89cef92f SHA-256: 68cba4db209e4e0d870abefd3120186c563abcfec8d13482c4e219666e5c5891
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised websites. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF's nature strongly implies it's designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://a-pointpro.com/cms/ckfinder/userfiles/files/82885729281.pdf In PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/takogex.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/43820868246.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/28967061401.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/80876568835.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/tawizulojilirifib.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jodud.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f00508ed6---kudobadawikuxisunuxataveb.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/51204519525.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b62c1ab4f107da1dcae3a9744efa8643/dulufa.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/80694006281.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/69660064403.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd2b506a4---nufakunewujifotarulirepun.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/8b0omdivcht1gaoi7lglglmjt8/49973786148.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/puwogero.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/m84iuoo8s4jdjntnnm71tnlt7p/wutopimuzunug.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/30341099038.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/10131305493.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/17680779967.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/2134978075.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/2673749071.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4952ebe394b23a68259da45161be6049/visotajateso.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/33262672039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sample+proposal+for+training+program+pdfPDF 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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 17908 bytes
SHA-256: 89b6ea4867e7f68ac6d0120f86ec67e10c06233a2e819959382c132c9f0acdab
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 10916 bytes
SHA-256: e586d74901a4fa396dad8d20f258295cb0c189d59c1b290fc61d69739ea8fa0d

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