Malicious PDF — malware analysis report

Static analysis result for SHA-256 0164e474dcb11444…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 06:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b14fa484c6160dae33213cce645d6241 SHA-1: f7010f5f57ed8d8280d8d177e6d2c3c8ba09926d SHA-256: 0164e474dcb11444ff0057c0e04389e9d5ebd20a82c418bea4ddd83df4aeadd5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://aaronandanthony.com/userfiles/files/99883942368.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac711892382---wefixuxulajus.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a54280408---53919671441.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/59001540245.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/83175396985.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160849514efbc4---piwuvapojusukelibusafi.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/49632229781.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bce64485---25426032345.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8784afeaf---pofufanewe.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/18pv88j2mli9og148qbak3oliu/fonavovamuzo.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/39190285381.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/8120852844.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7cbb00a3d22521fe7cbe03f64db0dcb7/bekilusotekogom.pdfIn PDF document text
    • https://keongracun.org/contents//files/gozipok.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/95a840b7af49b867b9908049d16ad945/fanalezeniwinuludiselo.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/32039422805.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/fkfvjurl9luea6nod3jltarvf4/vomegukakawalevexin.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f9077c60baa72522937fea20143b2341/59940501877.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/xenara.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/jikibamulujesanopowida.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/70340496803.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cd20994a938ce8f60bd1bd105a26e301/narosefetetu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8bd3a23910f9e08f345ed839c0df0be9/givorapomuta.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/nk7omcs62aehinfj55qddadc1t/xiwijiwakekoratawolufexaf.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/55425392867.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/90612467684.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160707d26cbb96---57701071797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+extract+one+page+from+a+pdf+macPDF 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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 16244 bytes
SHA-256: fed567f355b68a4d9106548f655f2d0eaecef731536fdfa1485afad0aece4ecf
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 10836 bytes
SHA-256: 45d54bed23a631214c6eca23eb898e6a2705cb65cc945ffd8f75d74423c81780

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