Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c63ca96239a161…

MALICIOUS

PDF

77.4 KB Created: 2021-06-28 13:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0ce05676fd883d912c85d51bf969c6e2 SHA-1: 340395be53ec97bb17a24c6488bb6abcbf9637ab SHA-256: c1c63ca96239a16134965238e053b66c3c18b0f70d843603716b70381b344335
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/sudavesobeninotonoxev.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/675b8b4aadc4200541acc83f4da30ff8/70944067622.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709ba22d70b---75835280297.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/zevewosopokuwuso.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3c29d9796102f90891ee7fe27f89696f/jotaviwetexivotorikateniw.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_125014.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6f0c77194e61558de8f8e10ca0b76e91/51802269027.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d53651333837ce3c41b176aa3c58a001/vukebis.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c20610142cd---72232221344.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff49e54ff---silodatusozulibepirod.pdfIn PDF document text
    • http://siembra.me/uploads/files/97402938046.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/mijone.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c00ee65d5---simefuti.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/nadibujuzinomegatija.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92686b983c---25987084770.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/587b378512e862ba2d2fab6156a154fa/veruvifotazufebomenir.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ae90670d75381d58c5775535b9e8f412/zuxeruxutoronofeb.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/84225638970.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2471e972cf03e11d446ae1d55968794f/7818183872.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/zufuxilojoginop.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/semese.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834b3085ab8---kurimepegimuserez.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/70557536304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=convert+half+pint+to+cupsPDF 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_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 10776 bytes
SHA-256: baea2ce9041cb6cbb5aa0fdce68fda365477325546b13380c6eaf958760c7297
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 16592 bytes
SHA-256: b133e47e1a486dfdcda7c21f667fcca49c164e66f26c534863f9bc349ca8e205