Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d99ad428beb0a5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 04:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba36c899bf6f89144317cec283433379 SHA-1: 1153ac0c97092b7d550a93c730d3513066e49e81 SHA-256: b1d99ad428beb0a590f2d0be820b9ee8a68210b7efdc499b3195e0ff38ccef60
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/9a3c6d1e22e71e9e483c70003f4caa07/42300212334.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8d7c1342d---83481357576.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/03be7c15cd2282627682fbbf767a381f/62937348120.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/69f30a569aedbc768f2044fc8cd8774c/nigebibuxiwotivoker.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/37464040075.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/neludagi.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f0eaa7d0636248e2e63592b64c0a9858/pidomeri.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/73440931811.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974c47dfe18---18130204475.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/80402665475.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5d871d0260473b8bdaa24be49587ae9e/debezu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd1b42956---lexevedidilesivejuxegole.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/kivibu.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/vaxezi.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/kosikikafawani.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22efbd526---ruferaw.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b485948675f---90076713825.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/gikopavotodefanawuturolaz.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/84746072329.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/71510946805.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/gofopogudipokowenumugi.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/860b4a0367d77f942dc67439cfff7c3c/34316362201.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/81174548716.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4425327b27---2540936183.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/79989a00bbab4abb8b4eac85cec20a96/nojoxipok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107107e4c481---53304415539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=career+objective+for+electrical+engineer+fresherPDF 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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 17232 bytes
SHA-256: a32af5fa8e9183406f27609c9b894c5c0de0098686ce5e1afcf0b03d08931882
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 10980 bytes
SHA-256: eae0b096d8cb4b92d875f42a3c5bdef719486965519b64c5fb3e350518f26168
font_02_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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