Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe01e5ac280c703…

MALICIOUS

PDF

88.3 KB Created: 2021-08-06 08:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94ccbe8770849f352aad5813a4bcec2b SHA-1: dfa6922aa33dcaf4d61fde279761853de707746c SHA-256: 8fe01e5ac280c70331ecd9caf845bc57a5e22d45564b66ae506d2e098ef3e049
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 CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8bad6cbe---43445071574.pdf
    • http://www.moyekolodin.com/files/gudusexajirujojix.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079582bcdf9f---tafetesililexaku.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c0497fce799aa30d7bd9a5ae01ad6e5e/mefikowujojukuzunimiku.pdf
    • http://timeyear-v.com/userfiles/file/95287064714.pdf
    • http://pumarecovery.com/userfiles/files/gagezibifukexenafedogix.pdf
    • https://fonixkoncert.hu/upload/file/bifip.pdf
    • https://bloomland.com/sites/bloomland.com/files/xakifadiwogajunaf.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mbmtfh1nhdmvgl9arp75q81o6d/nerabojupowuxuko.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e1d401e3---12995493185.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/fdo81jfgqjibqnvbf9hro55kdl/19815039212.pdf
    • http://infunplastic.com/d/files/65217993335.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160926e92ea4dd---79144860285.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503135016522931.pdf
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/sijojuvenobuxomukiwej.pdf
    • https://ekransamara.ru/files/15872644657.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ib5ha9lks362spuklk1o3bglhf/82448218139.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/tufifunogogemogowipeduxu.pdf
    • http://antifftech.com/uploadfile/file///2021050115570869.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5873df115---petak.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a447cc541f9---13432500164.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/omov77f56m5melmsg2v752ha5t/42773140848.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=unblocked+games+77+plazma+burst+2
    • 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_off0000f2f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 16792 bytes
font_01_sfnt_off00010b09.bin
2ec71b0c4d44291f89777fe1eec502c53a78adb8068f6a4c9ee85674e0c501b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 11336 bytes
font_02_sfnt_off0001256d.bin
4112b4e7e606e17b796a2b5ee7cdb7f26919a400184306a862e734f0519f792e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 17808 bytes