Malicious PDF — malware analysis report

Static analysis result for SHA-256 e071670c0d8ff282…

MALICIOUS

PDF

89.4 KB Created: 2021-09-12 09:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b83f2db8e3fe821a9acce20404b46abd SHA-1: 2f2521d4f7ff1ae5e44894fccccc90891e09a863 SHA-256: e071670c0d8ff28280fa4f610318583fd54b76f2fe7a9f637196121441e26dee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://coretry.ru/uplcv?utm_term=puzzle+bobble+free+play PDF link annotation
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/judekavapiwelazekevaxusef.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/20abd49b439b97c8cf969c5ea4fc2184/19944503202.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136808d06e68---xuxadixus.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/90140662037.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wimovapat.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/silajaxidadibaletekira.pdfIn PDF document text
    • https://vpmemorial.net/images/file/843064403.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/66171636148.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/38247258677.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/fafatizusebunasabikifenit.pdfIn PDF document text
    • https://digicpictures.com/downloads/dedisixodosebefefumilewo.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/12580078588.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/pipasavoxuzulo.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/kisedunumesule.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161337921ea9f7---jixotipiw.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1002b6a64---katezakabakijeduwuzixarup.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/foluzukafuz.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/88343832488.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/sejew.pdfIn PDF document text
    • https://wittnebel.dk/file/96053815980.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375ba2ab90e---jejejorupiwimi.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109051536415323.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/17096776908.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/27070031641.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/54626528865.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_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 18000 bytes
SHA-256: 724409878f95bd7af5dbde93e1624e58e45fe1dac9fbeaea5da0672a9709d481
font_01_sfnt_off000128d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E7 10304 bytes
SHA-256: 889041d3778dcfe10bce2b4bbe1322fc1f69de513e3a31a6a08cf4bcd387bb7e

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