Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8aab150ec86682…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 05:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6850e535243b521cec609624f4c2dd37 SHA-1: 7cc59667df4d283b2f5fa9033fda482499c4912a SHA-256: bf8aab150ec86682dde297e5d95c7448d0afeda8677d77a10ceb54a277a39f95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong likelihood of redirecting users to malicious sites. The embedded JavaScript stream, while not fully analyzed due to its nature, further supports the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://guanzhuli.com/userfiles/file/53444332310.pdf In PDF document text
    • https://radekslodkiewicz.pl/files/file/lavaledumabebijexarinupam.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/fixujedizuzitoz.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/nebadodewu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c0d7531270c8e750957c78c0c31e86a8/49896003564.pdfIn PDF document text
    • http://teakdeck.pl/files/file/94501395335.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210917084859_641564624.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/62116521834.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/tegusa.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///31226942590.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eeff89d349---kosat.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/96447875377.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/29179203442.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/58809948856.pdfIn PDF document text
    • https://jobtiara.com/files/files/19469168831.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/zilofuvedujitasubosolofe.pdfIn PDF document text
    • http://compsult.net/userfiles/file/menobopefefemafep.pdfIn PDF document text
    • http://csp.hu/editor_up/9484465444.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/13597304218.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/32522007318.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef311eeac8---budodipotijolej.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b199b05b01---zobumujikamoku.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/82201612495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=galaxy+fold+sd+card+slotPDF 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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 15856 bytes
SHA-256: 8fb143ee73c0dc8784e6119540cf3cbd367f4ad5140cee46518c111c109a8b81
font_01_sfnt_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 10396 bytes
SHA-256: fee86a377bd09ace18859c7e47da452065e5965c9b4e83c8cad8ff8198a2022a
font_02_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1