Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b709cb90d32001…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 10:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 160c279ecb12a1c6a69c33d1af49d191 SHA-1: dcf1d34ad2bda54e23900392007bd94d3860f3fa SHA-256: f4b709cb90d32001bf6dd82185600b9d9c313b4937077db153bc867865c549a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing attempt. It functions as a link farm, directing users to various potentially compromised websites, some hosted on disposable domains. The PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c4041864363ae051a4d0bcde27b1a1eb/damokizidiwigibonab.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/k9n55khvepfpp230ie7cpe2uu7/xeborujobelitifosulag.pdf
    • https://next-engineering.com/userfiles/files/pekiwijesebub.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54efef228---54345917128.pdf
    • http://utuin.net/files/fckeditor/file/50337813618.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a83837e49e---40180310087.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/f5b4055a8b0ad6e3aff64fd7bb644906/fabafukorinawixojepaxez.pdf
    • http://cafegreenwichvillage.com/uploads/files/81361629327.pdf
    • http://beamstraffic.ae/amb/userfiles/file/25694965099.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebb4f4f067---41204614983.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/50015488294.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/bebajufulemofulu.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6960d918236a4691d04a932907473ec6/19589671517.pdf
    • https://mimpishio2bet.net/contents//files/69051026163.pdf
    • https://medtek.vn/storage/file/40182685181.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a5d32a19f1433188d2affeaf1b590e2c/lodobimuletuxizasekuga.pdf
    • http://utuin.net/files/fckeditor/file/5842061299.pdf
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/27675607080.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161180c1bdbd2e---80571920146.pdf
    • https://gabconstruction.com/ckfinder/userfiles/files/nesan.pdf
    • https://nic-n-nate.com/files/files/9020356556.pdf
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/25590904738.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0is7rr5gpf0mgblt33tklnc253/xanelojo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=epson+ecotank+its+l6190+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_off0000da3c.bin
1913cc3dedd918fb790ce82771a8ebac0d3cf3252e874cdaa1ec687dbcb9c661
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 11100 bytes
font_01_sfnt_off0000f430.bin
aa145f3d4a58105e0552383a5ed0c595dac15f70ca292066b173973ae01729ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 20000 bytes
font_02_sfnt_off00012892.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 16792 bytes