Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d93a5ee5ac8750…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 11:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91a9c2aeb9aa5d60da0b9c2d5a994a45 SHA-1: 72cd6eb8dd637f96f5cbe77a670cd2095a83fb90 SHA-256: d3d93a5ee5ac87504c6b3c4f220dfaab1282acbdabd3dec68c5d5657adb9e25f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://masonhn.com/d/files/fuxuga.pdf In PDF document text
    • https://satybharat.com/ci/userfiles/files/32306912682.pdfIn PDF document text
    • http://chongros.com/userData/board/file/59739184864.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210904075353.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/95987799257.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/wiwak.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109080320564885.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/nifewowuxulime.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6bf466ca---jefadisor.pdfIn PDF document text
    • https://shunnasato.com/11586351738.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4818ea1ca0b380127d45c415888185d0/67622830508.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///rasasitevodojenefa.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/furakijelesalodopavazejuz.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/basananagapenokur.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/bopojotimenup.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/buxuguviwuw.pdfIn PDF document text
    • http://landpas.pl/upload/file/gizavitonabuliduselu.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/48971831228.pdfIn PDF document text
    • https://photojet.net/userfiles/file/17566960995.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/tofukedikurejafobilew.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb34818b8f---64695641563.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba997b93f---kegelefobozez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=too+and+enough+worksheetsPDF 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_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 16892 bytes
SHA-256: e51e9742fb2d5dd198fa3a432a7e60ba8e6bd221db4b6083c17561264588caca
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 10632 bytes
SHA-256: 6665307b889d252d9f19de3471b8c5064ccccde34131415a38c866161a8e53dd
font_02_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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