Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3f3173912ad42d…

MALICIOUS

PDF

77.5 KB Created: 2021-08-18 03:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f4f6328f00c72ece7685d6183a5cee79 SHA-1: 5f20fa6a6006be744e72226f2158cc07b9c177fa SHA-256: 5a3f3173912ad42d4cd11d220b14ac85ec38f8b7dab02262534c29d015cc91e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to external resources, including compromised WordPress upload directories. The document body is unreadable, but the heuristics and URL analysis strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://sz-nuoyi.com/Upload/file/2021072407355860821.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610464a1da62d---vufenedekugemereg.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/63400448917.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16255191575212.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/duriwak.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/62163261590.pdfIn PDF document text
    • https://goodline.by/userfiles/file/76044636180.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0168dd6da08d56cf2889e6b8210cdb8f/fukewovelipuwije.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/24592482642.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e1e97d21265d49046814cd0b783e07ce/22715379540.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/regog.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/53763241019.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/12196824907.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5ff2ef935fcd96a67441e7a5aad74263/59489954670.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/nowezar.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16097eddf59c39---gexazuwipa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda79f5a631---povuzapuleluw.pdfIn PDF document text
    • https://servauto.fr/img/user/file/zedizunibepa.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161045686ac258---85500648612.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095f867c926f---tavugimo.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8e5c7ab0f52c15ffbcab9b5f227db8c/41720354916.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/10538113195.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/ditones.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=rowenta+precision+valet+steamer+1550w+manualPDF 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_off0000c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 20008 bytes
SHA-256: f9542b03c9d8e2fa83ee78f5cce8270d75641a21fb767fe0753e8040db1f6879
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 11140 bytes
SHA-256: 50062d7dd4dee8b8026780b7d5a5c746a04f5625822b36d8afaf6d528c8bb590

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