Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c3ee99b7bbcca7…

MALICIOUS

PDF

109.3 KB Created: 2021-08-10 13:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86d0e4a329c7004eb46ac1c716354404 SHA-1: 2d06107044851ee7e87794c777d09ae7cb108ed5 SHA-256: f2c3ee99b7bbcca7c6df387cb5f987225b8eed032197d8a8c8672e665471ab00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://pistant.ru/uplcv?utm_term=como+se+dice+gracias+en+lengua+mixteco PDF link annotation
    • http://aktifithalat.com/resimlerfiles/28349097692.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/75065285484.pdfIn PDF document text
    • https://robertbah.si/files/file/65482670925.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/zagepusaxikaninegolizaji.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5371fcf883d6a1a097849ef9b82bac5f/6090838210.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/pedemi.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/nebipederifopogosufubat.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/80bca823ba5a9bd1eec297d4e9a89e1b/litutapivedesizes.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/xavazumaxulud.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/gidej.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/46377889814.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/97278392179.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/49cafe593494c88b4f9356a811fcda2c/lokipakekan.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/sabewuwadebif.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5640808099---4370803333.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce5b15749---81461226202.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a406514b48c---44319744579.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/31171629221.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/49222676696.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gusix.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/savuvotukolonudej.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ie2qsinfjs04uprihkb26g7b3f/26602029593.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AD 10948 bytes
SHA-256: 20c3c84987efd4cc99a10b282604ac2b80a255cc7f1e75da6e9af9cb41ce9bf8
font_02_sfnt_off00015edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDD 19320 bytes
SHA-256: 89947cc26b8e60117162c31913154042be7995c83830004aad70aba512d17a81
font_03_sfnt_off00018fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FD1 16148 bytes
SHA-256: 9dbd86b547c789e693a9447677f94902def939eedb7b34c80af7161f7c191d02

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