Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbca372492d460a…

MALICIOUS

PDF

102.6 KB Created: 2021-06-25 20:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6714237b39e1d8b1d763e09b992bb749 SHA-1: 30b68d0da7f7cd106c12dcbf90efbaf7919e1503 SHA-256: 7cbca372492d460a3511afd02ac11188ea5aceb331ccf3c9eab9e0f6dafc5ea7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the link farm structure and heuristic firings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22d95302c---komelavuzivimel.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a208349739f---lozuwadimisotesebokol.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dbtfshuk3aih8ls8tn8okkvf73/zetobem.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/6i5nvitg2jcv5936u7l55cqlil/mawigapisivuwotelijuket.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/r6hm52o5n6tn0436kj79i7ggrh/rixefoxugizimokitik.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8217def82d9c5755198bfd5992be6a45/kifojinegatatutijekifo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/de0a9987237ef25e326f0089005e387f/bexagugenonunowex.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a5f18bada3371ca2d8e6fd08648c4696/89222273246.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/73897841349.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/kunazawuzejiwomefajejifaj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041ae642bb---falejemaxerosut.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/dvh24p0cubcf29vu7hlt09flr5/situp.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qhnoee1qdjk65rr8ajkvq2qe5o/wikenoguzerazewif.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/42173060087.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/grib0ui2cia5ba9mmid6j5af1d/52488076210.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/rekodoxokisujo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082896b7722e---bigeganisojulipatanirofos.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5b6d4124---wifekosoruzev.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/37c4f6be129f0ae685817506ca7ffde7/funumunirikenaweduga.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/13e50dd02667cd60e41b440f3007aeb9/28719659927.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/39885718479.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/badizibetutupojixusune.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/68c13b908ccb3ae724f820971a440873/55471896972.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/vobifugili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=white+cat+with+gray+stripesPDF 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_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14967 10576 bytes
SHA-256: 3952ca8a815ab7f107d852e6e2d9674afc94a70f8c94d42495fd4c3dd763e89b
font_02_sfnt_off000161c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C5 16672 bytes
SHA-256: 66eddb32ab48d19d5d735b9e3e23b51dba3497cb3640270fa0100c73e4a319c9

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