Malicious PDF — malware analysis report

Static analysis result for SHA-256 2461554b866b0669…

MALICIOUS

PDF

95.2 KB Created: 2021-09-13 03:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59749cee28af017846f4a11b77ed627f SHA-1: e9d42393ac3082030892199bd702fa1847c43b9e SHA-256: 2461554b866b06696cdeb9fbbb971eef8b314b7893bc0ad681ca3688e69e1613
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malicious content or phishing pages. The presence of multiple external URIs and a link farm heuristic indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://035620126.tw/upload/greenkitchen/files/47463604268.pdf In PDF document text
    • http://ruresept.ru/files/file/94484596461.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210901_212000.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/bagewi.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/ludonosanadi.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea6d6021f---petawupifaxusedezuw.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/89462360071.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/55842745262.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/39148173208.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_13_26_50_7817.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/xokuxovanezupevepivoturo.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b054c95dcd---57238883423.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/derapumes.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/98043658212.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vumamole.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/47112863015.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/kilafusosel.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161388cd86be1f---74169576089.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/lafuwizimikiduk.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/rixozo.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/37917868111.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xivaza.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/joxas.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/kamoma.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/nagig.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/jazugofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tennis+ball+cricket+pitch+measurementPDF 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_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 10816 bytes
SHA-256: 4be52f1538138699185543d13144dcec7f79353d5c6564521cf3c9b7f0930d64
font_01_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 17920 bytes
SHA-256: e1dbc1e0ea3cc2b3ec850d5126abcf5f1cb3ae3c8ae0c4907a3f377d6f38cc98
font_02_sfnt_off00015731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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