Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd8917e79399057…

MALICIOUS

PDF

90.2 KB Created: 2021-07-03 15:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72c54eedef822d91e1ad4845c5bb4d4f SHA-1: aa2760acfab252627945eba1311520c50aa3102c SHA-256: cdd8917e7939905768d640406892d571c7d39c4175320de820cd4a56880c6c79
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

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 http://modamoda.nl/uploads/pic_lib/file/55438345379.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/lepakonuwomuru.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c965287b1ea---90383460716.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/velokawuxezaloronipabat.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/14557036940.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea1d382813---71447186944.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a228c3d27ce---63707357871.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/70495060687.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0416749b78---laxeludadimerub.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cde68baf762---13268316510.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5de5b822---sasunavur.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b5e9a9a1cc0430d21917e55b41bb7262/vukebejidefaninuvogewa.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ca6ad1c2e5091ca7224a82282c5cb427/bozefezagufi.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/vewiduvireferof.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3869dd73f7b7b682c0fe98af9316aad/21263622782.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/40133391684.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/zaviwirabivofitabumitez.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/30a402638c2a453e9aa2ceb59acd05ec/nurupexuted.pdfIn PDF document text
    • https://bloomeng.com/uploads/78619602541.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/jefevuweligujoga.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/59256529058.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cea7046d013---54317544960.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/migumuvosafeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=do+not+go+gentle+into+that+good+night+questions+and+answersPDF 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_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 16244 bytes
SHA-256: cd2907e365139af3e5b1a4235aec15c7a290621d4de1ddf9a3ac22dec63be769
font_01_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 10860 bytes
SHA-256: 44e43031c17b2e41f7ef301cd16d99afa5aa7f40805e4d5ca8c964c1afe06be1
font_02_sfnt_off000142fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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