Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1505fef3622328…

MALICIOUS

PDF

90.8 KB Created: 2021-07-23 19:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79357d9c511b3bcdc7e8644187b27299 SHA-1: 765ceb78eabd663a614857f76c09720c1d13705c SHA-256: cc1505fef3622328832975d3ed94bc22defdf5915ce8cb33ef0cbd31352b177a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/157ta42l5244b4jtn5h3jnnba9/36972027203.pdf In PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/19b4858706f3f67914c3349a6824684a/90155951123.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/20695722072.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/19a282623bce3d30cd782d483feabe19/verano.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/dfd810b32b035ad64295cf9083977972/45608317641.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa32d588f38---gasajoferuwogewozozuw.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160848832efb9c---3665992397.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/xewokuw.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7ecd182cf13fa4174e80406dd0e3d573/kelavi.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/56155641346.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/gabiteledikirijazifixa.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/37c8fe8cdf7a3e7a3e902245277db1da/36664072669.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160735b0ae0223---fomaliremobak.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bixububagodesomeximufif.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/28484419199.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607347c151ac4---mufodekixazavosukojijegem.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5f95051ac28d3b450dfaf18ac38e18f0/49985057607.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5k3s597b6anllr13s511v87l3s/jixelozumifana.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/lupegixadisijopojuzi.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/noguzoxoruwegajewosa.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/wuxapipigisuwugejas.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74d09285e---77871232810.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210622144233.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/50207487518.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/47b74af75166736747f1b1ec95cf79c5/nosur.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b22b086e712---wadobeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+care+for+a+ginseng+grafted+ficus+bonsaiPDF 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_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 17428 bytes
SHA-256: 0b7636dd5cd684f3eab93463e53269403d61f404746f72e063aca6222ea23f68
font_02_sfnt_off000143e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E2 10924 bytes
SHA-256: 8500ccfb6ac533eb672bec8527019f32f18803bde427cfe0b29f7fe2858cfe99

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