Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef78184bd0a32e52…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 14:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7eb4e4272f0b20d3b565816123cc07c3 SHA-1: 0af37b9945a51d6e86350a3e11b061be6544c571 SHA-256: ef78184bd0a32e5265a525e325e66e103e92917a8b91d1fd85d78b9d3b89dd7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage trusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://alexlunacoach.com/img/editor/file/9019665585.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a83c5d2c615c5a2ca388c483b163f73c/rokun.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/72357678137.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/temolirew.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/153934598.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/gizizage.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d07e8542b3---jabasagokogukekunabofefos.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/kuruluxakoriset.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/80257431790.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/43461847247.pdfIn PDF document text
    • http://temple.mo/userfiles/file/molebebip.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/31010036340.pdfIn PDF document text
    • https://eguiders.com/uploads/noviluwewizuxeziranuwur.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/22348643285.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40874422174.pdfIn PDF document text
    • https://redac.ch/upload/39953767208.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a8020fedf0b7e2f258a64bebf6781c0c/fabamenosegirexunifebe.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109111044354547.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/dabuzukowuvarigi.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/17443564057.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/58233551066.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/tisegapaparozarodupef.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/5173523423.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091220293373499.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/zamuletewimimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apk+mix+playerPDF 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_off0000b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 18204 bytes
SHA-256: 54dd8fda1838b254344f925bdff1ba92f31d03fcbf9d0c3f1b1b5c3ec95490df
font_01_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 10212 bytes
SHA-256: 791a3fd4b3bd9cc977716e229ea6bd1defe81d676a4333cf86682185466058b0
font_02_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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