Malicious PDF — malware analysis report

Static analysis result for SHA-256 518d01f95b0c9d03…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 12:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cce4faa6229efd3b66957c96f993e7cb SHA-1: 132c6c4da3e3b35e1a44a54be0fc319743b6d711 SHA-256: 518d01f95b0c9d039d9f4068452ecd82cc8299b901e883588a7621dd4d025dc4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document may also attempt to trick users into calling a phone number, consistent with phishing or tech-support scams.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://chamdure.com/DATA/files/18362095073.pdf In PDF document text
    • http://icmasistemas.com/userfiles/files/56262287050.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/nirabobu.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109161036291598.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/1901950996.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/tajewe.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161455550248c1---71055567345.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/80354350572.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/futexowuvilalexi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29a336534---67922987161.pdfIn PDF document text
    • http://timebymtm.com/upload/files/gotijukixu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02cbdbe12---857639558.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/2363043438.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/69641083145.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce4982665---90840664430.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/duxakileguwowegefin.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219211144.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/71975828039.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/23170474320.pdfIn PDF document text
    • http://arsvet.ru/img/upload/tidevokakaj.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/sarijekapafosewofug.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/sezukuguzomarugisupaj.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/91112233743.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/nedovawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=transfer+files+to+mobile+from+pcPDF 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_off0000c5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E2 16268 bytes
SHA-256: ab711ade179633f5cbd1932101f968dbd59a9afbccda7051f3290b01c43cee43
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10744 bytes
SHA-256: bb37d9875c0a11cbf12ffff7988d9e7f112615413c731aef15525f371428eb36
font_02_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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