Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ed5cb4cb0c7a3c…

MALICIOUS

PDF

84.0 KB Created: 2021-08-16 04:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b52cf239da2127dfc285c5d440130dc SHA-1: 6693221b6f2cded96fb8afb6adf261bb8b825489 SHA-256: f6ed5cb4cb0c7a3cfc61cafdac18080b8565861754310dfb86be44d88b3ae942
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, designed to lure users to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://webtechnocrats.com/upload/file/zukulovonanowir.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c482e48b66b---57216445019.pdf
    • https://hygradeinsulators.com/images/uploads/file/mipevibuwapewagufu.pdf
    • http://dailycan.com/userfiles/files/82416116246.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607af73305be5---dobabujitagodug.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/rifomodopufuvezawef.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21ca5972ab---lagiliwasom.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d027a33335---98912219499.pdf
    • https://alyosserspneed.com/userfiles/files/41798358926.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/39668118447.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ca01983c1f31bff5c1f86eaeac3aedc/49564278836.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0b68cce11a7772e5d62c3af43a8ac81e/36974408849.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794e3d5743f---10876246932.pdf
    • http://giayviettri.com/img-ftec/files/donexonezukavutopifufoxig.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c608c607f96---nefejewavebived.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210806185753.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/18375085240.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/tst39df1c6s9862i8jimbb5beu/jiwivinele.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a988a9840f---53631858930.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/bojikizovevemukiwolovamin.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/314ecd0f3bfc8cb40355774ff7f5738b/dasaxidunido.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa27ef5bdb0---resapenufedowoburugup.pdf
    • http://dwhs79.com/clients/15834/File/batopal.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mafia+romance+books+pdf+free+download
    • 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_off0000e0f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 16792 bytes
font_01_sfnt_off0000f90e.bin
31e05a4da240a9f2885b9f284f47d8874a5ebfd8324fb5cf36c06c73cc8711c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 10992 bytes
font_02_sfnt_off00011269.bin
cebfcd3b4728e1f0f2b183feddeeca5312a5affc46c56d7481d98d50cac6b5e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 17660 bytes