Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ebc2e4716e78a1…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 22:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93131e7f4e47d6aaa07c951e88149588 SHA-1: 78196b6174046d3b9088e65745e97793a7ebc646 SHA-256: 09ebc2e4716e78a139806852b9ae0e7737c66af855ed1b5083a5be73f23439ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=how+to+recover+deleted+items+on+outlook
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1cf47d6a---26905729897.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/13788072616.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d90ce1d8d---44955149115.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/012c6a41324e2b5bf1a4da43cbc72d13/71066713239.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8abed06df6---pesukumawori.pdf
    • https://nbtele.com/en/cache/fck_files/file/kaguma.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071110cb220a---xifol.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cac0916a3---58137708710.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160730c0562d74---duxazukunor.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16097637f6bd62---92674537718.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c43f686cde99d2d593081b5a5e0332b5/wojogididiguxekatoxadu.pdf
    • https://amitadevnani.com/userfiles/file/nosoguzoforazejizelezola.pdf
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/93242673031.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a434af5e---87986988696.pdf
    • http://pizzeriadevita.it/userfiles/files/57079377978.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0fd09b2da---kuwokotuxokilasa.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c0572434a37---59614006735.pdf
    • http://merwepizza.com/upload/file/30160577945.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e505.bin
660c2235df220c692c8174724fe71a8c7fc83b5f141f2d1df9a0917aa3ac4a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 17232 bytes
font_01_sfnt_off000111d2.bin
e990ee5ffd19ca0ba623cc01cda5ce9aa469e910a3f7a1b8974660d5dd5dfad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 10704 bytes
font_02_sfnt_off00012a65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 16792 bytes

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