Malicious PDF — malware analysis report

Static analysis result for SHA-256 0661604a7874c13c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 21:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 068d3a78e7bef5c6726dc2046ef0c20e SHA-1: a092f1876838aff31e098d80506dbe1d6000d78a SHA-256: 0661604a7874c13c57f9ff56872fb7cd4ece3b4be026449806570385d82a03b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://synerhu.ru/uplcv?utm_term=sniper+gun+game+online+play PDF link annotation
    • http://letnipohar.cz/upload/file/23626571661.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/22447326084.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tolenodasezonivalux.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/62436213587.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350b3ea7463---fodivuzutexomuvipo.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/92342181199.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/kokipawimitekuvekowewed.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/fafavoxewabotovesusiguxi.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/191598540.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/23304906186.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/58655894880.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/pitajom.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/fojefavonifidewudu.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/70501719682.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/64422919926.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/98233113515.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139157471535---ralemefunefekizemivewo.pdfIn PDF document text
    • https://tipresentoio.it/images/file/49276535042.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/nofelakezuwa.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/fazapet.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k6b25ck596oisdpje34mvrddv4/fixabemorekame.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/kefosudisag.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/91288149055.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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 17812 bytes
SHA-256: e8d4cf9e1e03aa8b81cd5e25d4c39c74233405499e5eb49a263730fee5714c0c
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 10616 bytes
SHA-256: 9b7e559db3b267b4e71daad581cc97aceb9ba25041133651125ba48d8736b31c
font_02_sfnt_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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