Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6c6c0d5e0cdbb8…

MALICIOUS

PDF

84.0 KB Created: 2021-06-28 04:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7cf21c2bf715e057c2fbe7376a74ffc8 SHA-1: c1a623bb124577a12e5e489048fef18f175df759 SHA-256: 7b6c6c0d5e0cdbb8776ed4b2f8712c3f3ad73f72d06a3c848ee448431e97b236
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of external URIs and link farms on potentially compromised or disposable hosting strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=turns+out+in+a+sentence PDF link annotation
    • http://charivne.info/images/file/kemagoxirasiz.pdfIn PDF document text
    • http://bienbao.org/uploads/files/38694354089.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b89b0c68e6c46ae1a018f6a44ebeba7f/ropeniwibonula.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/20245695952.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/36lhvlb00o69ov9gbpt48ealq4/82872595221.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5218c5fde---zesomasusulifo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7828d6a56e1be3487e334d6c425dc200/56765457229.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/302ifhu7q624erq1356jsfe8de/43293512024.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf4e000410---5209148413.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/13168583638.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/p88g7uq0hqk6sv4l4uf16vc87s/lakulisil.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea007135ca---97999255507.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d0b2c0963e9802c1380997c0b47b69f8/gakefakigetupopaxixoxuz.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/venadojobewebegun.pdfIn PDF document text
    • http://citra.cl/userfiles/file/kexenovesulitiminimuwi.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/71000397922.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565ee870ed---mupewuxikixovitux.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a81a1d583c---20252775224.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b17fed6f969---72465923002.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/gafukumovinim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a22f6227d---41731940783.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/zavavujiwelomigil.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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 10240 bytes
SHA-256: 5ce49eac2fa6f50afde38734a80d1ae455a90bfdf3b6015a4bda01805fad9cb9
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 17764 bytes
SHA-256: 076ffaf033812f341a46a4a5795022005d681e98a5eb7227f5af44971343d863

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