Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e6417f8ad30d80…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 003f9b7ec96b37a7ccafbd6e5ef164bf SHA-1: aa3d4e243671be1504370b969384b31c48b6fa5e SHA-256: 07e6417f8ad30d8072a19b6fd1beeda74f20b720f22823c77fc14553052ff958
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that form a link farm, pointing to various PDF files hosted on compromised websites. This pattern is often used for SEO poisoning or to distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=aptitude+and+reasoning+tricks+pdf PDF link annotation
    • http://woods-china.cn/ci2/userfiles/files/20210825103856.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/10435672492.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fa743c520f8974686a56efa02a5e753d/93169231362.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/biliv.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e4cf9a3418df9071bf088646b9c35e46/wakozew.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/44108387152.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081d28f33001---64229262672.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a35aa2ce4---15074974483.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160823be15ad55---49281776680.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/zaruluda.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/43452995295.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4b36cea2b---41989995018.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210823151629_exogk6.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/manuwutanijisowewefozed.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/88475925564.pdfIn PDF document text
    • http://tion.hu/upload/file/woxonilaxi.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/xirobupogojuzit.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/98b95d2fe805d5ee3113660e0073cc3d/15881549157.pdfIn PDF document text
    • http://vinmexindia.com/uploads/rozuwadejusujuwuba.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16072db1b81c76---vipodazujimedivol.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ca015975ec9d912006a7c5a7da766eb0/47827756513.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///75164560827.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/nizoxumufasem.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_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 19552 bytes
SHA-256: 655169b63fbdec01be6580c1ff9480eaabe44eff0f0903b987bae470e00154e1
font_01_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 10924 bytes
SHA-256: 5b09491398760e02e3bfb742d949b7cff6f577614ae384d6f982785906f2c4c7
font_02_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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