Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b19c1e2ec4929a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-15 11:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49c0b8f7aa260885dd2af6c9b47a20cd SHA-1: d6810f3bb67339fe1e12a5b5840a6bcfc2b21c01 SHA-256: 20b19c1e2ec4929af4625cf07b8edcb032595359b4638ab57df0ce8bfcc5737e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on various websites, many of which appear to be compromised. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lead users to malicious content, potentially exploiting vulnerabilities or engaging in social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kp-bs.ru/upload/files/befigepefudibowoduvovivif.pdf In PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/towuvisamew.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/somevike.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/gefofemutepujutoma.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/pifaloremov.pdfIn PDF document text
    • http://insei.eu/userfiles/files/vafagirob.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/tamiwalajupuxe.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/41442650879.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/31262185566.pdfIn PDF document text
    • https://ksuskalology.com/images/file/88544125587.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/95402714716.pdfIn PDF document text
    • http://www.andreapondika.cz/file/36411121934.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/43892544020.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ktet52f26vh6emvoeo44jsbc6s/61600337652.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/31848220023.pdfIn PDF document text
    • http://www.centralperdana.com/file/pafufuxagijafisab.pdfIn PDF document text
    • http://wixoon.hu/upload/file/25957720938.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392057d75f5---70384372487.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411bc8f2145---bipapilezojowinisakonomax.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/81354151942.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/13954157323.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/jolezoxebozodita.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/77167552372.pdfIn PDF document text
    • http://hadt.vn/upload/files/letikegibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+android+to+iphonePDF 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_off0000b75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75B 16424 bytes
SHA-256: 1a2ba08f540335612638761d6925d539838128bb3cb56b603a64d7bdf7a494c0
font_01_sfnt_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 10612 bytes
SHA-256: ad62389a7fe7bf14c010e47623717819b34da763728b26164ee758d4f50e9644

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