Malicious PDF — malware analysis report

Static analysis result for SHA-256 2811e33f32695193…

MALICIOUS

PDF

91.1 KB Created: 2021-07-31 00:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdca980f3fc9c7d913a802132e5de53e SHA-1: a6e85f43f50d836704d6ad80214875713864c87b SHA-256: 2811e33f32695193c1c6cdce8c7798006f62064b501a0f709e02fdc5f67c9c8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The primary URL, https://wastran.ru/uplcv, is designed to mimic Apple's password reset page, indicating a phishing attempt. The embedded JavaScript likely facilitates the redirection to these malicious links or further obfuscates the phishing mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://wastran.ru/uplcv?utm_term=iforgot.apple.com%2Fpassword%2Fverify%2F+apple+id+zur%C3%BCckzusetzen PDF link annotation
    • http://dyglas.com/userData/board/file/pamigak.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0fu5m4tg1grmkf96rfbuv88ilg/14989199708.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/96979356372.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/8d07cb1e91cdb146a8c40ae187467eeb/fizox.pdfIn PDF document text
    • http://tai-group.com/upload/files/zuwitafaremovafaf.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083289459a9f---fedejodila.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/nigepiruzotoledufoxobugo.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/foliwewemijifolew.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070800490097.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/93896379474.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768f2c1d959---40761668319.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f854828785---lesatakujonitexalepela.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ac72fcc5---29167003034.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607743890d460---27084143084.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c40a8bfb5f1c24fbdb957fb4afe2b13f/81703290640.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/duriduvowodugowazox.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/11358872472.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2hfjor75eokeq6j8jorapcuq6a/nituxovunatipuvumeget.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/vuvinoludoxosoweloluzuzo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c18283787---bojenumupepisu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6752c9bc5---54679108173.pdfIn PDF document text
    • https://cristalensi.com/public/File/nukalome.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/jabozakiwejidolutonoz.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061916055073499.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/89601575354.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_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 17448 bytes
SHA-256: 9fee8a20e9451232b0b0ba1a4469be81c93a4dfc1b8cb6d08658512d1cdb3977
font_01_sfnt_off0001270e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F25 11724 bytes
SHA-256: a2efe01ef3a771dd564c04740a2af0468d48e04ac8c7b1be761655d9b1a185ff

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