Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0996b95e6621c5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 21:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8cd650f5fe99b7ea8e0538cc4ce6da44 SHA-1: 7aa60df55b6da70c2b1580b48f04717caa2be795 SHA-256: 2c0996b95e6621c52b9686dd1727a5b014bf8129f6e57bd27f78414d1df11024
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://shethof.ch/cgi-bin/dynamisch/file/giloxurowexofusowakola.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75d55486f3---belozixepodotota.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/14326562746.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3be6a881ea135b7bca703992acf94312/30613022194.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe30849dbc---lidete.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/jajesivisudabedug.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a0bab5b8---8062366368.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/nedanirurip.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b4cf5ea16ee4b46f416a8b06e8d85aa5/dujadalatow.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/76924814063.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4dd8d2e1---18899624651.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xalapeluluvupamaze.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105051347194417.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097a97c26e1b---33849838029.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/74202309079.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/megewabum.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/39594440017.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/66646484841.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741d6246612---zokufalezawepudevunufe.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/fifarak.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/kobug.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/98063970425.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/20e02c2bfabb466b263800b3ecda923b/bilede.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/79142065315.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ff5894e62ee2c3bc74ff117b2e7af3ad/jipozamapixokumexuxoni.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/37900155184.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/39596438328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=reham+khan+book+pdf+download+freePDF 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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 10768 bytes
SHA-256: 49e3f4736412aed49d6158ec7068412260501c9c069933d96021a3feb55ddea3
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 17468 bytes
SHA-256: e0c2494efe1215f67f862c0bcaf4eda5c7b17d4dc8d142bd4a0c1f1a6320deec
font_02_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1