Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc05792bbdcf88b7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 17:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 999c762054204bef7bc823441052309d SHA-1: 9ecdd58d86da46176eb41c9109cca7c25bdb32d1 SHA-256: bc05792bbdcf88b72a72b6b7ac7cb90642b45f568f17423fef8139ecebb0dd42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=import+export+chrome+bookmarks PDF link annotation
    • https://evrenmentese.com/upload/ckfinder/files/fuwoso.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/viwej.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/rumodenetirogojajusuxi.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jusemigun.pdfIn PDF document text
    • https://subarini.ro/mm/file/85727040375.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/sitagasozamemedixoroxaj.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/vuzozisokefo.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/30463880624.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/xomalewaxiditonem.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/86132864826.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/batifigowimexivanugad.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/semewufojuvepazijef.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/18947896900.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xawogavar.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/62056afc3e2ed1dda58894236b919720/geridun.pdfIn PDF document text
    • http://klemanpince.hu/files/file/79408230027.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/95275197737.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/29319004676.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ea5e4cfe---nozobesaj.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pimeputepabakuviwata.pdfIn PDF document text
    • http://seamacros.com/upload/file/botamix.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/5421351743.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/36046161881.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bef44d63731dc9ab70f7444ab827a5e4/lodole.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/kipilebiviwobejaw.pdfIn PDF document text
    • 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_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 16712 bytes
SHA-256: 00ee196226f263d24ce60f5bd5873d3a3897e8435803774318f681b51a5de9ea
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10684 bytes
SHA-256: 411cd9528e2e7fa72e139b09c715525c3f0416f92b6cffb0c19273d5f4e2c253
font_02_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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