Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cb9df2c59b841b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 15:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bcaac88aef6510f74eddb81e3a4b65c9 SHA-1: c19aefab3909fcf3745d9e7a6f9729d27107468a SHA-256: 62cb9df2c59b841bcd0cc00fb3b4baa496d7da24e5855192f2f7b1d2cd980562
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of these links suggests the PDF is used to facilitate phishing or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vurirazakubarakukotazikej.pdf In PDF document text
    • http://elencostruzioni.it/userfiles/files/zejodedolaviz.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/13201671207.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036fed781c---mawominotoledi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136895553915---99089270202.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/67423805340.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/21391988639.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7a3eec6d---25447807156.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/lisikasuzemanelififitol.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/lebevozudanisufeneniba.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903073101.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/10220640027.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/73374404357.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/26420cf01cc34c14c743ed5dac0efa83/74778476378.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/40371423043.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sodoviguzelek.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7btfkbau24mgv1k6vpi3i2kmri/96821884372.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/94284521820.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c7c38c6b---jolejivavo.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/zusisubekivukuwara.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/71803100157.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/fogilal.pdfIn PDF document text
    • http://saktigroup.in/uploads/zutogoguvaxegu.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/34150219079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gta+san+cleo+mod+apk+downloadPDF 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_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 17600 bytes
SHA-256: 77c8d5ee41824d968c9c96cb73a0a092dfcfbb069d4f486d27c01605d7b23595
font_02_sfnt_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 10700 bytes
SHA-256: 5285366503c382fe75250ccf01c03a44397a8664c1a5ffdf92bdcad17be650be

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