Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd835e9d238c6014…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 16:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a003fa5a5519f54a49ebd425e523025 SHA-1: 69ac5224a7c7246f1c6dcdbcfb355d20737fe4b1 SHA-256: bd835e9d238c6014eab44037cc916a9e1fd85dc051cdda91cea948fa0715f181
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristics indicate a link farm designed to redirect users, likely to phishing or malware sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/be8ca13511267df1c28412fcb2bc379f/pevefozaruvavakemumikaj.pdf In PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d0af1c14---42649928981.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/6787618978.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vititexuvaropagolo.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/tunarorese.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/86064828396.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beea92491a4---4815496701.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/53021522714.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4461697911---zisonikepedotopewojizudeg.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/30f111f871af767cf080b1b5f409b991/69266637642.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/menafiwuki.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811517ed009---62647908798.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/vumuzufuvoviwej.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/nerujidigubegutubomu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/68a8kr24h54697rvj6fb1o6kbe/wekodopon.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609697fd2cd3e---27748319440.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/13867524360.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/r7kfla13cek48a9uqv6ehso5gv/bisebuviworiv.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/86732907550.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/14176688875.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/nugojateveluma.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/xodajobokumakoxiput.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/salamenadogetukenik.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/tizavatepam.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/77445204484.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/93516941599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pdf+to+excel+converter+free+software+without+emailPDF 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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 11096 bytes
SHA-256: 2758ad2adc011d9e2de1fdddcf03afcb129e2c59f901f774950dbc1f39eba9e9
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 17696 bytes
SHA-256: 4e6c73ac398d78a7666f267afdc966464d7d3bf3ebfc21f705ca1f7b7fbb1456
font_02_sfnt_off000135cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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