Malicious PDF — malware analysis report

Static analysis result for SHA-256 a385e2c0c1e75bbb…

MALICIOUS

PDF

93.0 KB Created: 2021-08-04 15:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66389fec2b7fca9f21921a9fef4fe6d0 SHA-1: ef3aff08c9aafb8f03f28e916fbfa6f6467cec78 SHA-256: a385e2c0c1e75bbb6a561dd2397f14c88679743b139e630fc59135b86b9e45f8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised websites or disposable domains. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the true malicious destinations and potentially distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://tasleemdubai.com/userfiles/files/fesuzuda.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608395d17a505---77825794546.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/78d8557fbf7eaad8c06ecf491555f294/vamelusalenaxaparokol.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75af05c560---muropalewixodenizapepet.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786a624fe98---82042590604.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0dn0cggjn567qfc8uqpsocap6g/sidamofasetuvulal.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuviku.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160941dfd4fdf6---34608853321.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/86618931088.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb371c5b3---lezikopomikonolo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/85104454142.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/89973447075.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/dosoxabebizi.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/53338305610.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/fumezixagesowoxolatasum.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/mulur.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/95868995479.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/add124bbb5d109384f45faf5e7ba5e20/83782967990.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/65830839597.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a057e835df---gokonipo.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/0d517e72f7728a70e41343a8f1cdf847/gazutivip.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/au5ovp3r0vlq8d6l59o9qj86qo/31326676685.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/8921779584.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/nakobebugapumifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+onlyfans+account+for+freePDF 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_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 10788 bytes
SHA-256: 1f8e9601ccae60348719381a85bec8e66dade627587fe060130863d20d87f925
font_01_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C9 17372 bytes
SHA-256: 2cdde3694d32ac56f6dedf0c68fa85af9f9c9fce93c3fef46f3f9a34e655a83d

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