Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce875c3c962a5440…

MALICIOUS

PDF

93.4 KB Created: 2021-06-29 23:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 306f64d944956368e9a960e4f5cb8464 SHA-1: 5054b2aad394ca9d63d9dc06175326879ffa6161 SHA-256: ce875c3c962a5440917309c1f8529c6b02e2eaa6322764af4e6f589840e988c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. Although no scripts were explicitly extracted, the nature of the links and the PDF structure implies an attempt to redirect users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba970e1f3b8---potebedodoni.pdf In PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/vupapulijivexabo.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/fonowutazujuvuz.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e097d0381787986164b8a85dccc8ffd9/78772033400.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/bosopimopulikelasesa.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2b76e0e6---91233991110.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f01d3abd---77029458389.pdfIn PDF document text
    • http://kudusde.org/resimler/files/26759590083.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/501680c9f8cbc2ecf34af493b967fa32/batovitonomavo.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/pabemulefiker.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/21493895265.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/85884283309.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cbec7140f---61290432377.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/46114035405.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2149027ffc38b4f2592b092cb9205445/80046564313.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc8d796cc---fajifajagisa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802facc8d8d---92970706576.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5af9033846878c6a2eea3ac3b4f066ba/83240050925.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3bebd1137---xedusodifasumubix.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/k88437rspe9n82f6vubci5dp2q/keridi.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/rubunavobokakanejewavo.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/xotifudusoje.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec83eb814c---72436179204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=blue+and+gold+macawPDF 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_off00010947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001215e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 10496 bytes
SHA-256: d23d1ccbf7ea53adcd4613bdffe224fd479e2fba9f8879bc874ce27459ce8290
font_02_sfnt_off0001390a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390A 18032 bytes
SHA-256: c1eb5568f4edffc5dfd61afa3c0fd9569799379bbfeeb73224c3ac64eb32c30b

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