Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6055571c688f1ae…

MALICIOUS

PDF

92.1 KB Created: 2021-07-21 22:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f8672869585a048c38e09cac7554956 SHA-1: 82a0f164cbcea71dde16379f397becc9ad0bb9c6 SHA-256: c6055571c688f1aef396b8b50898a63da44a3fbfadba4bac1f52ac9f5c47f6f0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lamekatus.com/uploads/ckeditor/files/wobujigubarewadetidux.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/b7c0705ac790d20f69f7a285f02dc9a1/waxudexataxuwiweloliratu.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/57938697284.pdfIn PDF document text
    • https://vleek.com/uploads/files/misijologedaxobamusa.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/vivizobevu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/kunutidozibosesevofi.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/zifivumelojogenesabiwe.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addee88b53a---nisunarazusep.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec9c530240---14885858753.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/42039722700.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aba9869fc---dokaguposurulukagarogo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/287140414db97fe8b1cddc45adb741bc/dabotuzalilojosoju.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9563da40a---texaxadoweb.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e73e2c8590ae9e1d85ab925201af8238/vikevudozup.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d360fe56e0f8577689345e7038c97201/dulidapuzivinabisuliwefo.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/35320704785.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/79369915730.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bcee8a78236b617d81fb852055448d47/47483722158.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bvca3isah7phdudla6hdam4kp0/60403458080.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/44bb43263da8e1014c175a9d9730838b/vonazekonojoz.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/73254718976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=why+do+we+do+researchPDF 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_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 16668 bytes
SHA-256: e67aa58e904de7f826a85e28ace4549d5eefc17ba23f91c70f2e389a0429d7ec
font_02_sfnt_off0001488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 10320 bytes
SHA-256: 6208bf557c8e1d4848978377c6360afe68410fa90249ff707a25be36012604fd

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