Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd495b981b008ba…

MALICIOUS

PDF

643.6 KB Created: 2021-08-01 03:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 832738b4ddb1c14b7664ee3feb6aec27 SHA-1: 1c6dc340e659d26ceea26b89489816529a91c85b SHA-256: afd495b981b008ba44e3dadb1cc841714802b89f20c26875b9e2d3b4037b35b2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, which likely serve as a lure for phishing. The PDF itself is heavily obfuscated and contains no readable document body, suggesting its primary purpose is to host these malicious links and potentially exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8491

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0725b6e432---27774910528.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ae2ef0b9---79789040477.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873e49d3767---19700611863.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/11672628965.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/18c0620cf754b43f4247dfe9313f6203/17336125772.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/65714698944.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/18795565431.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/748l32m4c7je7ah06mc4sinnc5/44070032948.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a177e6d3a48---moniginanulusarewiv.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/91122138078.pdfIn PDF document text
    • https://2winit.com/Files/files/buxogupaf.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e1s341jgl250me1gf33adkod0/variwipejomek.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10961b1b45---54385689435.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6880d8f350ead70b56b14b0707a1590d/76240645389.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/49946e2291af3eb4368ab5d811e3a0da/sunilisiletixabedoniba.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/65388797813.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/49i9fuva52d8k2hkuqqdsh6cn0/78791736905.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/fuzewireluti.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd35bc723---zuliraferodewiraluwur.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/db137fcc3a21a3130bea1342ab1c76d9/febipe.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abc86f61407---96695065755.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006ba53f5f2---fosemosorivowazorok.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/5002606528.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/88258188215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ecuaciones+diferenciales+uam+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00097f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0009979d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9979D 24604 bytes
SHA-256: fdb07ade38bb51565db143e46abf37d7ea82662648ebc05323e91e5f9b5bb483
font_02_sfnt_off0009d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D73D 10764 bytes
SHA-256: a6d6c48a3b5adfc5fcdc25b93cc3fb912e2cec6ab233921f1857c361751891f7
font_03_sfnt_off0009efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFC1 2224 bytes
SHA-256: 212cc09315588b5532ac40d9113f97421ccf50376562f4e87c57567c6956a21e

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