Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ed11ebf9de89f9…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 12:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad14b5304a08a8de33b0d8a4f2e03898 SHA-1: b6d3c4f0251f8ed77dd5b65c69cbc2cd4a182057 SHA-256: 21ed11ebf9de89f9cbdbf43156541ed9f2a350af86867714a325dcae1b46cef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=pocket+7+games+apk PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/071cd1fbf0b5eb69dd500f2c14add7d3/zotuzuberonujegapeg.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/93927119981.pdfIn PDF document text
    • http://nktrading.qa/file/files/guxixifeli.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/siwasosud.pdfIn PDF document text
    • http://rhondachem.com/d/files/87907265249.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/66012458592.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/xepemizenodej.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/52394585494.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/gomodorusirudesugukava.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f883f94b70---84019709883.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/58029668349.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/disaxobexojej.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/70hu2gmk3okikie6elhvpksb82/sifivan.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/kebijebawokefitupod.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/jizinedafutu.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/70710686170.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/wibevesudufekelinuku.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/demasutulorenulir.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/84436151016.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/bipabotaxudalaturu.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dikodapun.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/dezowelolekajo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/jiporeletudokidaxoj.pdfIn PDF document text
    • http://co-mit.com/uploads/files/minunaxogevadigelevukoju.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/81786750316.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B2 18140 bytes
SHA-256: 77432d1d443c182a10b30616e08a806b1f0c769f447a99862b56f55bf6c8eef1
font_01_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 10520 bytes
SHA-256: bf1e18f19135e4b3d8e90da98a85df010e7af3f8af90bbeaf620a1a2c4b93382

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