Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ffffc19c5da011…

MALICIOUS

PDF

88.0 KB Created: 2021-09-19 02:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5467763dd916a87fa7a038d2e7a0dc80 SHA-1: 0af60e3e3a7a489bd2ba6faa6cc9156eeb905950 SHA-256: 26ffffc19c5da011994dfc4e55879cd6756179d7e3ce8e5fd5b47eaa97534d55
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or link farms. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial scanning. The embedded JavaScript and the nature of the URLs suggest the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=how+to+debug+app+crash+android PDF link annotation
    • http://tanriovermensucat.com/uploads/genel/files/mozofuliduzanukalumikik.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/10532511976.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/62031140493.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/88535741987.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/56341176064.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/zujixulotafudus.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/20992179927.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210917120303.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/jufetijopera.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/27988656118.pdfIn PDF document text
    • https://badoza.net/userfiles/file/67138302466.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/25607578682.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630853421.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/182033359595.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/80cd0190cd0859643946d0d86b0e28b1/89430393646.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/gogulufalex.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pikud.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/02937c2dee7f3c36473893ea122bc607/23700379439.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/mewakisumolubexubekup.pdfIn PDF document text
    • https://equinox-e.com/upload/files/togipelalukowowat.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/42005437359.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460e511d9b1---34180846544.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/94319498386.pdfIn PDF document text
    • http://podarox.ru/public/files/88069854069.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/20424812647.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_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 11064 bytes
SHA-256: c1b1f71d7ae78a004df8570c4fcad8832c26aa9f18f9a884103f8253e03cc3d5
font_02_sfnt_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 18000 bytes
SHA-256: 5f9eb9be4109763930de19bdb31058d73fc97801a623a2557bb2f2e7613634b1

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