Malicious PDF — malware analysis report

Static analysis result for SHA-256 3467e10806a53532…

MALICIOUS

PDF

88.7 KB Created: 2021-09-13 06:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06a73ec8f6ffd7820a82159bf6dce150 SHA-1: 5e1ac3ded6c875ddd14185d9e42b701a499a2126 SHA-256: 3467e10806a53532ff2ff0f202a441cae8725d2797be8c23970c30a435df505c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://kamkmori.cz/ckfinder/userfiles/files/53221122590.pdf In PDF document text
    • http://lex.tj/img/file/varelatugigopuboxok.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/xagamu.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/gufezobolizova.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109011505421393.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/xosiludibeboximomum.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/5220642936.pdfIn PDF document text
    • http://soles2walk.com/data/file/simivomabamekefifekafe.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/padufofometijeriweradota.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/rakobitepafumova.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ab7391e4---logidudiwatinalano.pdfIn PDF document text
    • http://centronegozi.com/public/joganafosad.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/20356968745.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/53644555884.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/23978226799.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/37762173574.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/papixojexututajena.pdfIn PDF document text
    • https://aaaxxion.info/images/file/gemosixuraduxanidi.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/47663359257.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613882d1ef24d---gidinagiwub.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/72663236462.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/pivazituzeketalov.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1acdf0f8ce29cf9b2c933bd046cc25a2/megabuwubu.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/42265792058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=most+heavy+android+gamesPDF 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_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 16992 bytes
SHA-256: 5ea1b341171d42f7e53b1600b49bd3b9ac9c22d5bef424c9b66eaaba1ad9e80f
font_01_sfnt_off00012478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 10820 bytes
SHA-256: 62883185300d96f107aef0277ee390e7d8f10f01e10550c8e8360791de620c23

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