Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1efa20450e15af…

MALICIOUS

PDF

101.0 KB Created: 2021-08-01 21:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0857f2d163cc3e46d42f650af632869b SHA-1: d5a8aee0e52bd66ea7d8524f3a23c5d97487c8e0 SHA-256: 0b1efa20450e15af1349fed814e2eaca4afd84a8d79a9cad3576864ac4e78fe3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to phishing sites or download further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://doo-san.com/userfiles/file/20210508171806.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072997021996---furoxas.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a034ebb4ab1---55135144768.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/29116536303.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/43843665970.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pvj8s6dmbaii0mt07k9qpuf5g1/59314421028.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/59914937898.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/60260911167.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/73543095278.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb3356205b---34059405230.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c21290454b9---2810842694.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105fbb9488bd---nuwapalupapupodosi.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1038790d7---zesudanejilevo.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/jomiligox.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/5538554dbc29058c03d4582cb2c9008c/lisutevimugelufani.pdfIn PDF document text
    • http://cjatkinson.com/userimages/17238482227.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/tiripetonexajifinoxutuk.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/61775841619.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/sezupelolag.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/pujopazuloporanipapedi.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/gowimiv.pdfIn PDF document text
    • http://indecomavo.pl/inc/47517483596.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/35320842064.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa1def4d9---pewis.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/21668370499.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-15/20210515135705423220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=comment+faire+une+division+avec+le+diviseur+a+virgulePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 11016 bytes
SHA-256: 3ee3b9074d74d0cf17bb6fec3f73431a3a17088228696f6e8e00a4c2c9c0df9f
font_02_sfnt_off00013b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6B 19740 bytes
SHA-256: 14ea57da1ed2c727435673170bd0a4db782ad9de62387e869b10690706442ff7
font_03_sfnt_off00016d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D91 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed

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