Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc7a5f4bb17170f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 03:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3871bb53a5afa15c194b364bf5b650a1 SHA-1: fc2afd6c5288a7f0ddb413c31e89fde4eeb43089 SHA-256: cfc7a5f4bb17170f98c96f229f68c0849bc2f6a6c9c5373dfbdf74ebff93f5bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=grand+theft+auto+the+ballad+of+gay+tony+android PDF link annotation
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151e204e0618---20338252132.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/10999320569.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ed50990a485f97764ba60d735505c81a/zisagubaboluxiwejaro.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/99135272051.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/kipef.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/gqq6sfucq4fgu8pj4qpvsdkusf/50808090478.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/90875801711.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/linolabipevozaxed.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/jofitojibupafot.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/waxesesuwemefilugibe.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615103f433425---sidowep.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/zobupapu.pdfIn PDF document text
    • http://kccmaul.com/files/files/koxufaxexixavonuvu.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/57777744747.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/1ee3c3329aee7ac77672afa0111b9dbd/lozesuporinufudofe.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/gamepekixejetoladolotub.pdfIn PDF document text
    • http://www.toptehnik.si/images/lamulinevelijovakupen.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/54522016537.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161308684874e1---kizevig.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/54866486655.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fef04ebf10---6845902541.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/jaletadomuribeg.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_off0000b1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F7 10860 bytes
SHA-256: cf0e72f8043d50ad6fd47925827174364036ce37d4903beb1f09ec29f8f73698
font_01_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 15448 bytes
SHA-256: fc45fccc4519a41a8db0c6592ca048d90b3914f9952303d279f6c9035b89beca

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