Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b85c9b04692085…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 22:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 363c58b49720fc5465234368a252ae16 SHA-1: c6593564901e69d9deed47bfae82dea0d51a6024 SHA-256: b2b85c9b046920851565230bd36c8005efac283c2d5d2f4d1009ba447b70f507
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and presents a full-page image designed to trick users into clicking a hidden link, redirecting them to external URLs hosted on compromised or disposable domains. The primary attack pattern involves luring the user into clicking a malicious link disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=install+windows+on+android+phone+xda PDF link annotation
    • https://almavilag.hu/files/files/fenovuragogadati.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/jobiso.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109130555421197.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/22714449193.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tiromevagudukegojiwabozum.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/93007767760.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/70121359923.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xakilu.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/rezabijasebo.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/rifenevatafakikin.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/sakeveneramuwopase.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/80434001514.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/62946534445.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb3e248ad---liranedafasenipipo.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/12970411516.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9a01d27a8---6222338214.pdfIn PDF document text
    • https://csodamalom.hu/files/files/33233036372.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/nexutukopijaku.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/44c4ed8dba820e57f908ab5e0828c6a3/44041642518.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/rilaw.pdfIn PDF document text
    • http://normel.org/files/upload/file/95104092597.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/6805603619.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/xuvomemunaletola.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_off0000aea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA9 10628 bytes
SHA-256: 712acd245bddb2010481db23766c7e21211d4f7d954bbf7a697f9dbd2c69cdcf
font_01_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 14120 bytes
SHA-256: 5b84cc7ff452f55e3d54275c77158aa1fab36556fd40481eaaaf92e65e78c9a8

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