Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b400b1aed109cc…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 10:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4a3f8bfc3aa290780ae4ed44ed9ac21 SHA-1: b34cd4c2fedf9047278b3942392ef779df8ec66b SHA-256: c1b400b1aed109cca85be31e049522b8a257858d6126f6414b111016ae28c616
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised or disposable domains, suggesting a link farm designed to distribute phishing or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8113

Heuristics 6

  • 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
  • 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://irlanc.ru/uplcv?utm_term=osi+layers+simple+explanation PDF link annotation
    • http://119pump.net/d/files/52454706112.pdfIn PDF document text
    • https://dafelia.com/files/38549857112.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/muwilinuwadutudekenem.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/72594938687.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/19719446709.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/lomoxinaxifovuzuziwegowe.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f8b5d33a---94142391398.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/42364470839.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/wezoxexanapegobunatas.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/kiduter.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/lemupaf.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zefikezowudife.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/gopemosuna.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/46793078709.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/diroxiwogi.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/51089778750.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/magidifus.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a8701f63---20086192948.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/6762258411.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/593e9c22a1663bb119753c0a9ce77208/43780372164.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/28351683657.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210914150110.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jilopemuwutazuja.pdfIn 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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 10656 bytes
SHA-256: 9111d8c7ac8c4ddfd80403d15337c2ecae39122ba1fbbd9ec1e5232d4aca3930
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 16900 bytes
SHA-256: e0fe008fbba320860e2f9e9007886630214b9a700c29230b54dad4f44fd95de4

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