Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e957e54b80aa1b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 10:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 198daff51bb227e4a1c22a76a554f8ef SHA-1: 5b1231c72eaaa5d66d21ee8a4be112d6a000e6c8 SHA-256: b7e957e54b80aa1b2a71b87e866ce2e8b8417504e32e5d3f4f526abff821f878
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The presence of these links suggests an attempt to direct the user to malicious content or further stages of an attack, likely through a social engineering pretext not fully discernible from the truncated document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://bachtungcompany.com/upload/files/49310326488.pdf In PDF document text
    • https://isosklo.cz/uploads/9563319415.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57894807042.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/zojafifuvirovozeziwubix.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af62cd85823---wukokasigilugo.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/nidenonefu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd637a0073---naxufowubuzunem.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/94771683932.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/nefofedupusipigizapelodan.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/12355623477.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/58148256335.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/59dcee44d1f962ad000602c8546071c7/33798754470.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/61551592358.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5904eeb8369ece06ecabb315582aaf31/fevodozov.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/43165496509.pdfIn PDF document text
    • http://groupkaishan.com/d/files/79446194979.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a501f82c3b2---xivudasabibawanimenenati.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/rekexijekomirevodumagomu.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/34355793697.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/32669222702.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/93845006248.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d92f5ef---25003692080.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/volodiwidufom.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076119ec34a4---26471628435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=someone+like+you+piano+sheet+music+pdf+free+downloadPDF 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_off0000b8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AA 16464 bytes
SHA-256: f89a94795d8c502246d26b6f889289367eb4131d01a324cbbc9fb080dd43edf9
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 11352 bytes
SHA-256: 10d57e0afc76df654124caffb6450040c03bcce8a58c666079aeb5da8a2a60a6
font_02_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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