Malicious PDF — malware analysis report

Static analysis result for SHA-256 030879b993142cc5…

MALICIOUS

PDF

87.8 KB Created: 2021-09-03 09:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a340c9ef6a7023e7b965a38e5522203c SHA-1: 245b7a73efcabe04b997e9139460e7d34b5082a6 SHA-256: 030879b993142cc5c51fb7e302fd1a3511916ebce8c9318963aef26e4d3c2b7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress upload directories or disposable hosting. This suggests an attempt to lure users through search engine optimization and potentially deliver a second-stage payload or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://agrilaui.com/userfiles/file/latisakuvili.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c799b495a99---nugolewetoledi.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/lixodaz.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/246a2294130e6690bee24a087da10e0e/varobokopepenu.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/62927811292.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c4c25a5e---xujazawafozij.pdfIn PDF document text
    • https://2winit.com/Files/files/2023970225.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zuvimijiruxugiguzoj.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608361fbe7d6b---77835193095.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef370d7a75---bubejel.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/52777687634.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e19d8e045fd---62461150763.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/sukividoje.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/42644751804.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/nuxikiwigipuziguvilokufen.pdfIn PDF document text
    • http://rsst77.ru/upload/files/50756140985.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/57087440130.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/basazuvoxavosisiz.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/72234980261.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210718014152.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/fozodamamovetujasibe.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/21657880414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cobol+pdf+tutorials+pointPDF 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_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 17980 bytes
SHA-256: 24645fb1b3c65d8bd17cdfd184ccba62c1ac1714e45e352c133a2b2246f644b7
font_02_sfnt_off00013a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1E 10632 bytes
SHA-256: 1e11e5289868ee99a7fe922ebbd11400c1885655c5b3c213bfda447ad19075ee

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