Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7d7c9059f8b9cc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 02:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abc936251992f031f4078ecd18c3ef3e SHA-1: 80d78971bac253379843bc4831e29ddb1bd69f07 SHA-256: db7d7c9059f8b9ccf2443fef5c9bbb2e0bc060eefbe070b76e7d80cc79d7d389
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c16f4d4273---18235718575.pdf In PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/wudovijopabe.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/5702242349.pdfIn PDF document text
    • http://specimport.by/files/files/17717331930.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/34230944462.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/34370398715.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/tolujowunanewomi.pdfIn PDF document text
    • http://pbpharm.com/upload/files/73463293681.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/72330987200.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/52018640342.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/surivezipevojisijabelam.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/16129042921.pdfIn PDF document text
    • http://iscelenie.info/files/file/474587658.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/16016707100.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/fazomudekasake.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360396c8fce---jokebazebabagupajitadika.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/jilipufuwodajubazo.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/naxiburujilir.pdfIn PDF document text
    • https://betsin.org/userfiles/files/66434095157.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/wilotodonivisotasegeme.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/kefajikezonodasaleto.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/83130275850.pdfIn PDF document text
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/53906014626.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/ropozagaresojodi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c76778616b---67295536142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=where+can+i+watch+fast+times+at+ridgemont+highPDF 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_off0000b275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB275 15664 bytes
SHA-256: dc00b96e5466f0209a3d637957aedbae84d4baf375bf3d503b4a83adc65d47c7
font_01_sfnt_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 10956 bytes
SHA-256: 11658e877b80891855610d385df6d993bfd19e4c46738af9c8cffa5d0a746824

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