Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea12f9737074b34d…

MALICIOUS

PDF

93.9 KB Created: 2021-07-13 20:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2ba17f38a03f8f8da334a97602380489 SHA-1: aeb8379a9709d1120602282bbfe0ac4bf46c2399 SHA-256: ea12f9737074b34d4695f30981c34c5c4b78855b1bf29c4fb4523fdf72dbd1bd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=92mm+to+inches PDF link annotation
    • http://samnakthodrahassob.com/userfiles/file/siwefisozuxowunavowigugid.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5abd4393---26506103388.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/86741790390.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/83648329756.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/leseruzupirujejup.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/kpvctvukt84timbtnr6bh82j0b/tewimerapokurunejo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e22fa8a7f2---tapozipudurefama.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/3355fb5944f6a717827b57a37b9376ed/vazobubepifudunajib.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/14726138463.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb815c5a2---30028323019.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/purazoxexanobetu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ea74759e---birifogikoromub.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e887e048b2---3731146680.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7a45f0d24f44c462734ef59695e0a209/vuditixolagik.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/finedel.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963bf500078---79149196156.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d30e65833---64444126507.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/35798833092.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d939c5928e8---60647748304.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/meromimatit.pdfIn PDF document text
    • http://ubest.ru/images/file/kulelevesalajitowezom.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b329d94ecc5.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/25886521200.pdfIn PDF document text
    • 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_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 10376 bytes
SHA-256: 35d5f712d08ac4feb0e2b08738d491b74dc6d3216b57bc386338a301cd4e8238
font_02_sfnt_off00013e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E39 17092 bytes
SHA-256: 9cf855ea7be59a64505980feab1b6dc15464591dac99478f1319c1b73ee55fec

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