Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a1c904abc3a450…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 06:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 929ab0c350b912af814f9ef91138192e SHA-1: bfdc8c73e3df9a2ffdfeb70748519e52fb771f92 SHA-256: f2a1c904abc3a45025cf53e73f16d1d360f8c3ac814baa3e3415621d340eb5ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=leep+procedure+for+hpv
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9741k2grohnk64jbiq04246grg/85157597918.pdf
    • http://compsult.net/userfiles/file/24889281938.pdf
    • http://maslag.eu/userfiles/file/76787170946.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7btdij2j56lacbfd1qk4p6po18/ravogafiwolejem.pdf
    • http://www.irrv.org/uploads/files/38450914509.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/10a24b102347e215f32b58050ae06d0d/10858267901.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ulpaikqsndhcmm50m80mafsm5/mubokab.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/kaxufubexanabumegis.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cbd4d6cbc---1523081652.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073aecdcdef9---rufubipiwiparuwa.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b2de44e8804bd8932a4f67084279399c/jelixabomepewodu.pdf
    • https://pt2-turbo-j3t.com/contents//files/20277745796.pdf
    • http://magendans.com/imagefiles/file/88903962317.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/e3b9afe3aaba1ef01d237457e5806fa2/75441385233.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/def887fa9cbf44efac13e148e4d2c0b8/kopelepetonejewubu.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826fb75a6bf---dugadip.pdf
    • http://mistralizmiryonetim.com/uploads/file/1758422299.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9fc1433f---30115266184.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ee3d3fcd2c160e5824f841aa25aa59cd/60744911742.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6c4bae6d---nipotazadu.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1cff4a9442b85cc713edf51c0e8c0f06/morawibijovisazurapow.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eff47582c---2799199740.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/46576609052.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_off0000ef3e.bin
d0f6bd9509737e5204778081b045111c50574d7cc8571c49b26a78c1b40c81e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10168 bytes
font_01_sfnt_off00010615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 16792 bytes
font_02_sfnt_off00011e27.bin
56069242ff0c1d6b83812c142d7d7cfa5c826b0892e18805193dade2323085dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 16648 bytes