Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a3f5298a43d81e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 11:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06ebb138ea88b2e71c351de3603359b3 SHA-1: f057e01715f1c4709911b53e72fe47098c796dcc SHA-256: b4a3f5298a43d81e76b07b1e48f034e06338044a1208d9bf7fbfb91b69b26947
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to compromised or disposable hosting domains, a common tactic for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL distribution suggest it's designed to lead users to malicious content hosted on these external sites.

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://krisoc.ru/uplcv?utm_term=good+life+bark+collar+manual PDF link annotation
    • http://forti.in/userfiles/file/gefiwurexel.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/37855139674.pdfIn PDF document text
    • http://riph.pl/userfiles/file/16554497155.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/74c7cd22b7ff1340e5596e4cdcbc06f2/sulukuwamuvuvajaboludiwo.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/37671020445.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/wotogabawenego.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/paxere.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609553acd1a81---zonutakubimifekeneti.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/fofibogapepox.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b799ebd547b30682e7c1d6d6b176c45a/6737414957.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d9396417---21926464294.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/savovilefas.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/tebalobikusotavad.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/89030540798.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/63a4dac5ee9f266cf828f2891c392c5c/filiso.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/mewenupegerotigig.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/vijefuwijujukaxinijin.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/maguketelalazixuwiteni.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/2137886313.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e9da9a87---nadofetadifominasiten.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/kurusako.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/daxudenarokotevomadoli.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3ade515724a460ea93699dd63f716286/wiwuwewiwijopefu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0faf700678e6beb2031bdc6ca72d231f/megisawaneteboxudijizub.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607122f4cf381---lesoxevosoninilunu.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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 17556 bytes
SHA-256: 8c0000f506ad98d012152032642540f422519aaf35821d07b62cf0e4fad8e93f
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 10740 bytes
SHA-256: 86d1958d1fa9d524d40c1fef78072a3338834341aa41c2ecd22eb4272183a6bf
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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