Malicious PDF — malware analysis report

Static analysis result for SHA-256 744f61a8a653d319…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 06:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff7f2f651a81451dd5d605bc7c4d2b87 SHA-1: f22f0117d28412bfceb337c5d5776d01fb65df94 SHA-256: 744f61a8a653d31938f6d24b8ff1cb84ef5c5b45eafdb071f6d68c6876eba9c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that exhibits characteristics of a phishing lure, specifically instructing the user to engage with remote-support tools. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into compromising their systems. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://doellefjelde-mussemarked.dk/images/newsmail/file/fisafugixu.pdf In PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/4818865366.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161237d0e4eb1e---14988350424.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902320e963b---mewarulixexu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/14801873628.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/vodejixumozovarus.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6183e53ab9a5177e0b883e6667db5aa2/jimujobofel.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dea763eab---51152212073.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126edc7788c0---muwipesoxorumatok.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/xoworil.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/36547223425.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/29252965566.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3a02492d563e0f77cae4bc1bd8a5ac49/bofididubit.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/6ae222ee21141e8e4dbd3d15ddedbc7d/daroz.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc05badfec---90654884553.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/riwixarelolewafodebo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2da20b7e0---mugigud.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/63499887189.pdfIn PDF document text
    • http://waterreducer.cn/d/files/wafevexerajugasotogasulem.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aephddc20ea0hs3fbf36okl6g2/xabuni.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ade503a5d---zudagejesak.pdfIn PDF document text
    • http://debten.net/UserFiles/File/genufemapu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bcfa7d053---61969709074.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/19180507547.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/49849750026.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210811224643_mjxful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=open+pdf+online+adobePDF 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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 17592 bytes
SHA-256: 6de856aa23e2936bdd0239a7104810d8b43cdefb754651064f1b8a32cb0a71a5
font_01_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 10288 bytes
SHA-256: 45329de4b6bd962f86ebf4253fa41ad0d1d5191904aa639153684b0310575962
font_02_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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