Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0fafffb8a3a203…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 08:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 387db4d8351ff1a69d57bba6733ac2ac SHA-1: 3a33b288d4baae8b30a1d1a723d51c2f820bcf24 SHA-256: 0d0fafffb8a3a20334f0b4fa87e4cdcc705ce307242be3cba15934a167840459
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nfc-lampang.com/user_img/files/wisamarilesivusifexusokin.pdf In PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a5ad5294331c715de72441bd0856969a/59799256017.pdfIn PDF document text
    • http://rjt1.org/upload/files/mijitepuwimego.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2b6e72ca950f69261b0b0bc681bfcbb3/totanejizojobemesojise.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/lifupebaxolix.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/85326435014.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/60913019624.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/47627843770.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c283f4a5545---5116813104.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/76182983793.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/p3f0kbno6mvv33bqilmtcu3cun/87003808843.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/vefixobuwukutajo.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/nomedirip.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173ac17c2f---2659201281.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/fazililek.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/67730955170.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7vts7md1r5tdfvbvkhnbq9e19/senudes.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a39ab1cfd5---83705360120.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/wedugen.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5164cb6205---kivipobalaguvumavasokeba.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/99054917557.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/54247103095.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7o992nr69u8l39eat5ll10jicm/narejige.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/51263941199.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfafa7cb66---rivunezesapiri.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vugefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=english+worksheets+for+class+lkg+pdfPDF 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_off0000c152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC152 16708 bytes
SHA-256: e070e0ca7355e78f3c6eddc0136dfbaf93ff09217e1475938496b38c0e62554f
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 11060 bytes
SHA-256: 1bc0c518826578acb86747ca2c22a36e99ab3b5c9f4fb442b1afe8e42a7a3470
font_02_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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