Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6bc0c3a801d030…

MALICIOUS

PDF

83.7 KB Created: 2021-08-20 03:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88a3388d3c42c808c2494bf34876f237 SHA-1: 216fbab6ba0a8ec8e4569518d3fe40c2668c324f SHA-256: bb6bc0c3a801d030cc2ea3350965777901d7e601e28de442864c573c9e54464d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=fox+business+anchors PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/eda99909d4bea2f73f3197a9a34a9064/dorazagujemafozik.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/87889447197.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/neboxuzalag.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/xabikamixusagu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4597164fe---visudeva.pdfIn PDF document text
    • http://lawina-radom.pl/files/file/bewodalaxatutukijibexa.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/favekatonawamavazelifuve.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c0724b0e---niduvemelinezedebofor.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/45561856282.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/bazabu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c0287cdb6ae983354d45a0e4d990febc/87881257156.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/51020709669.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9241a1c27---90593121243.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4513e6a4---wosowevumajenemu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/58217572578.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85583952251.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/98473697540.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/93740829958.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/42933605870.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cbee00559c386ceaf5f6af9dc5e7052/naxiruma.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/zojilavejekakog.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/waxufuweliwosik.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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 10500 bytes
SHA-256: affa82cd656574e3c846f7eecf4358e6b6f5a924b777c7f721af175e945394bd
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 17296 bytes
SHA-256: 54fdf983c40fba2f51228a5c0ec8a11d0abe892daf7feb3c1b8c09d9ca1dae74
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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