Malicious PDF — malware analysis report

Static analysis result for SHA-256 1035f461248c1fa9…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 21:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 392d2d414b3b9823f0f46ffe35569c04 SHA-1: a69fb3c7d55f7907ea5b51f5f03a560ef83513db SHA-256: 1035f461248c1fa901867c31af75d45f971d4ac2ec2be78482b421d6995bfa8f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads. The embedded URLs, such as http://aven.su/userfiles/file/nuline.pdf, are likely intended to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://aven.su/userfiles/file/nuline.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/jp6gl3f6kl6jhk0oq1cuo856p2/dakovulidonamupa.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/94011562833.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c67f1c55dad---girojinirufalufekipe.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/83286450165.pdfIn PDF document text
    • http://maidichike.com/upload/files/20500862369.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aio42qsl163c7jm5lt3fksnul4/nosizilokijaguzosadi.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/aa543fc849f3879e49fb766b52a17315/vutuf.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c797d7f955---34274984237.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/belawefenomaposugubunifib.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/paponosexuxedin.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1653936cc3a62d18fa354f8a95227be0/dekewenujun.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052518103673499.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h9b35m70k2f9v6a9u5d6me9n01/vedoxawenij.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/52495917555.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094441057899---44326018944.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/mofudevu.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/xokotikexiwumumor.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d16c6b9b---9632291202.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/kopb3a3cqm6a0l5m29c1fjiv33/67364353519.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/44184219769.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/69480296840.pdfIn PDF document text
    • http://valeneighbors.com/userimages/24934103978.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e79ed6d7a8---kitegaxonatumakuloridapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ics+200+questions+and+answersPDF 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_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 10844 bytes
SHA-256: 64674a7cfad11f5e32c66bfd1e8d7bc47fdf5a1c0cb36b3aef8aa8726693a219
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 17472 bytes
SHA-256: 87b15e23bb24762aa725798f1d2c996e83a3ca1980dd0f4409ac6706fe5fcae7

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