Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c40be6d8c38aab8…

MALICIOUS

PDF

98.4 KB Created: 2021-09-06 21:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8351705b1698e3bf8ac4096bb987201 SHA-1: 07cb4b6f25f7bc55e28cc4949faf8602bc402e61 SHA-256: 4c40be6d8c38aab80cd2e867a2298b8a9d543ca05701c1f3cbc3e5ca9f27cf7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute malicious content, likely through phishing lures. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 https://synerhu.ru/uplcv?utm_term=x%C3%B3a+trang+pdf+mi%E1%BB%85n+ph%C3%AD PDF link annotation
    • http://voijin.com/userfiles/files/xitiso.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/roxividuwowake.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7a92d5155---61080824101.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dhhbuufvgdit65pcvdbb7lc88k/jilojogifukifeluze.pdfIn PDF document text
    • http://djpress.pl/Image/files/vejabegopived.pdfIn PDF document text
    • http://palami.by/images/file/36918405611.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/noxogis.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a93bd0d12f7---31544896226.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/5685591205.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/binejakemixogexaduwo.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/28270034902.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c4c25a5e---xujazawafozij.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/gejowufugizutitofi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/22f823a56208497cd5acfb2a02d3b791/sepupozupune.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fc9c6t8k6osqrf8lvon4uqm1cf/65421678771.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/terujixobezugojirot.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/zafodukotederoj.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/dss4enjn4jl8a0jv7jrc9082bg/44946365997.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/82739965613.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d14ec8307f844b1b355d494aaa31457f/40568444749.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/16870553387.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f94a20f5cb---42161107477.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087428612d52---kikuxakaruzobenisozenav.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/03v9rst71sok1734d974c9kfsd/30711947103.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_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 17040 bytes
SHA-256: cdecef49af11aecbb669447b0a1689449e6f048a8b95c6d31aaa6bcb157f50e8
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 26112 bytes
SHA-256: 0b5b89f14b1262e6e654df99022ff7e783d2301abe33fc9c9086252869655c71
font_02_sfnt_off000148e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E3 10956 bytes
SHA-256: 850f5c879ec8ee5c65c04f48113722a4558fa3cfb641891e10bc2be70af16fc9
font_03_sfnt_off000161e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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