Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4c80ef216a9ad8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 18:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f228eb00f1b51d29fc23486296f2f89c SHA-1: a128fa8696ff446b65f7af6ba3c6378d9b6ecb8a SHA-256: ed4c80ef216a9ad8b865ded89d4e1f3c10f6d621726c02fb05102d58252fe1a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm, with several links pointing to compromised CMS upload storage. The presence of a 'download button' lure and the ML classifier flagging it as malicious strongly suggest a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://viettelhaiphong.me/data/dulieu/files/pitazi.pdf In PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/nopipolipoguwa.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/90839523551.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/xuxuwunaw.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/35524106108.pdfIn PDF document text
    • http://c-six.it/userfiles/files/11472964697.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/51141512458.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/mudodezonawukusip.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dofifamofu.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/sixorida.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/17889264753.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210909223055.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/54151673839.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/53982741637.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/koradoxiwepo.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/41893452107.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75ca8b0a3c1b9b71d529e02f7e06b413/sewonutulikinudavozuni.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318d1055610---toparirasasobiv.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/mejikevinemego.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134285db15a7---41332966549.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/95066097082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+lego+cube+androidPDF 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_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 10608 bytes
SHA-256: 389fb58c6a033e9a6d57f603d87f4a15656dfc4f9598aefc2e72832e2ed23c75
font_01_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 18060 bytes
SHA-256: 2f8d58e540c02403f7e02744825bac0bb7284bf539914ac9a527e35ac3835db5

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