Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8de8159c00b8f60…

MALICIOUS

PDF

90.9 KB Created: 2021-07-14 10:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 119548a30f552593b024ce6cd571298c SHA-1: d18dbfc71faf73c64b5e4b404b47f4eecf429fe8 SHA-256: d8de8159c00b8f602f3b598e3d4c41d3f9bb67f6cb100225da735e4581743c75
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

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 https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/62df607417a0403cfd563cf4851706be/figomafawobefi.pdf In PDF document text
    • http://iseveranscopy.com/upload/editor/file/10419117846.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/85021499641.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f1a0b2996d3c503d89c037127d01373c/mujunozu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0d6a4ab99a4cdf50872adeca4a3ad180/tebisegupizitive.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210713075335615.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d7e9592d6---83452428825.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/laxirebejafudigalowadupiw.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/visuzatolo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/864st9eh8oeuoicqkao1h9gt60/68122355203.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2912cb89f6---12085188524.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ppr88vkckhgsrfjohvjudt52i0/ponekevorulununibazaxojef.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m0lfgnri17v2mne5ibbr6rbt52/novagunenofu.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/mofigofo.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210621170631.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/58049754755.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/98994230116.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/78521110154.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4671582af---dekibujujukizimijevumirud.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807c10f2f6---88521964874.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/77184023073.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210624052400.pdfIn PDF document text
    • http://carszana.com/image/upload/File/67308020217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fibrotic+bands+in+lungs+treatmentPDF 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_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 17028 bytes
SHA-256: 8b7c4e0e37bc5dafc2aeda642a7a47d20987e45b310e5dbcc5dadad5eebd8b74
font_01_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 10932 bytes
SHA-256: 6d17755f08e369e849732f5cb0e1573d7888be8ba5d732e334bfc2c478790fcf
font_02_sfnt_off00014645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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