Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe3ec43909d4696…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 19:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbb33ab59617041c3e452e7f3a7c3112 SHA-1: 4727a650ef469d61fd9ff21c4399032fc97d639e SHA-256: bfe3ec43909d46960c8a74056979c3f65df46a2df4db8294185d1374aba0a557
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://depcip.com/app/views/panel/ckfinder/userfiles/files/8295907435.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/eec0e9a3ea691e45096594cbc3f07117/gororiragirozinevejixaja.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/jexetajuvokarugodas.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/butono.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/60342005710.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/60476735765.pdfIn PDF document text
    • http://klhl.com/userfiles/file/45830859913.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/80360580211.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/595115780.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/faviwitepoxakawubabomir.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/vesovejefava.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109190913135035.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/9323226717.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/17310600229.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133898d3c0ea---suginibo.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/widurefogebetoligila.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/58147854792.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/63646409159.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/29223684372.pdfIn PDF document text
    • http://liily.jp/upload/file/20210911112008.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94bce0931---89375796207.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/11566248081.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/subavi.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/bopewodave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=videoder+apk+download+2020+free+downloadPDF 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_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 10612 bytes
SHA-256: 9117de2298fa1386b9df5a6ddb41b102537d59b3655e9690f60e7fc37d1e5ed5
font_01_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 17800 bytes
SHA-256: 26c0a96e1daa40112b4559917c462e8c46fd79b635db4bc79a79d67c49ceb526

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