Malicious PDF — malware analysis report

Static analysis result for SHA-256 96968412968b58c5…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 19:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67d8a02962e283fa7738290f2baccc05 SHA-1: d6fecfddb8102884e7419c53c93c00e226722ee9 SHA-256: 96968412968b58c5bce7743006e6203ba7ce1f6f5f09995f61c89ff917e6cf26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage distribution or phishing scheme. The primary attack pattern involves luring users to click on these links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e7eca4af35623be76884dac37661ad7b/11904613473.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160717b2003b40---xakiv.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/61382119918.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/koger.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/99944023984.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9eo46olsf98bgkjqdlv0gar4g4/vevuleboj.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/zinuvakexubov.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/virafuwuneputor.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f024a71d92---28451493852.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/jupukakalun.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/17852880042.pdfIn PDF document text
    • http://charivne.info/images/file/gikidevekaluv.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c51ad5e97---41204231022.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rd5tel0q1sq7dl8vba8uh0774k/68293173518.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/120923c25192d25fac21f07651e42ba0/62778692929.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/52607467429.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fs8cgb18m1f9t24gahefodrtg0/52459307523.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5131ed9628---87093828650.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e58819cf---witevefu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/21148714495.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719efc7f62b---xuvir.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160988d5367a41---97116824110.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/pibokawimimonuxodus.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/64409889369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cpg+tsx+stockPDF 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_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 10136 bytes
SHA-256: f3c91eb2ee7d14505403f11079cecb8ab483692c6d61b64a76df081b109d6407
font_02_sfnt_off00011831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 17472 bytes
SHA-256: fc608d2cc1b1d84fe2a81777a5f372e66e84b1d997244292e5878604c2a26b78

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