Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf37b76cd325aebc…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 22:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d52a0fd01e323d53e26ff70b143d7fc5 SHA-1: 8331c85065acc01165b499df12f5d425e1701a9d SHA-256: bf37b76cd325aebcdbb66a2fb4857643df9665e00704b197485d1e975697f7b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The embedded JavaScript likely serves to redirect users to these malicious sites or potentially download further payloads. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=yes+virginia+there+is+a+santa+claus+editorial
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/imnp2nv3fb5e97089422p967m9/dukanidisido.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608141febf6c8---kojokikovojunilodana.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6af93157a90bff69c935850f1c9478e2/logavezuruvogurosubap.pdf
    • http://elfuklid.cz/foto/Image/file/13416578804.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b69173cff7---64318175862.pdf
    • http://groupkaishan.com/d/files/41541074245.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/68d4545ea6e567b8937c8a7abd2add38/39972649344.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/89354a8cbac5e758c10159b11871b3c6/pabedazilemitixupeva.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/u4j94cmuj3qnrce51jr910vahl/xisuze.pdf
    • http://alexlunacoach.com/img/editor/file/miwavunar.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098afc74b8c3---3211006082.pdf
    • http://mackyz7automotive.com/js/upload/files/16142953543.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8a479ae03c858e7fc3e0be9e2ec5c87f/2344852538.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lern6c0j5trp3b9q904ea218t7/91896885605.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/etc4k0c1aid4tud5ipjt264f06/42130562110.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1b1692964d5c40f44a25b0b294565328/89477414777.pdf
    • https://prtl.pl/userfiles/file/jimopetoludeviro.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8f227e4c---1975928939.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c95bfc89c6---lazomoxatofunuwi.pdf
    • http://terezmisszio.eu/files/file/kezezazapazeluna.pdf
    • http://ahlhy.com/uploads/file/041309178847.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9a67a8c0---87796834857.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbc577591---ramafumepatugedapof.pdf
    • http://project-lovcen.me/userfiles/file/26992233185.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081acfa395b8---7718094443.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f048.bin
64db6103f126f00e3bdbc4880388b7d83b78dd7c075a8360d35c1c386a9e94c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 10800 bytes
font_01_sfnt_off000108ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 16792 bytes
font_02_sfnt_off000120fe.bin
81f3b8b68ad40277454501b972438f443a981753f4840e8af82154e0bc4af2f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 16848 bytes