Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d30fda85ae73ca…

MALICIOUS

PDF

81.3 KB Created: 2021-07-01 09:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d9c4afff97d257a698887c75aba8004 SHA-1: 4eca8904e5b1205697e61dbdb7ae9cdec431dd6b SHA-256: a9d30fda85ae73ca641a2e7d1d60810e85fe59b10bbae955685813f4792b10ca
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The primary goal appears to be luring users to these external sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2oc8t4v6g5l6sfc8hmbn3n0g01/96605832799.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/96507629db0c8fc22ca84cdced2024cf/bixadiwerox.pdf
    • http://ajivikafinance.com/userfiles/file/561466768.pdf
    • https://schmitz.cz/res/file/55927160281.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095710f3d137---92489528932.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/676e216250f604e5686179e67c8ff641/40441992045.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/04b04d5d801c2eaa469a466a508502a7/malupegivixaka.pdf
    • https://palezieux.com/ckfinder/userfiles/files/61547997354.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/00301e59c0dc7e3fae060cc02a56a3d3/mesokilug.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6kiglbp4vaeiju3aqqn3bbou2q/nalunegurojumovukasaw.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec775685ad---42758836375.pdf
    • http://china-hold.com/UploadFile/file/20210629105817378.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/vd7gp9k128u40o3btk9340nvn5/76305558703.pdf
    • https://elnativocoffee.com/silver/upload/files/perod.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e044d0e61ed3413de91c70eaea0175f8/38052464613.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/p9381nvqgme6nbrkhiit2c5v30/zavajefazenekitofofu.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc13dae266---67174716136.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pakexidomok.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/o38ro74ai8gjkgo5j1j44n7815/daruzemiluz.pdf
    • https://gaziemirkentkonseyi.com/upload/files/6511388691.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0eacbdf02cbbb67d6c2b1e88af5137c8/18608329544.pdf
    • https://educhina.mn/editor/files/jurawoxukab.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fd5f1f97fe544d7e10b0b17906c02ca2/zagapikaxu.pdf
    • https://sca-kc.net/scauserfiles/files/figafiziwexoneg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=spawn+protection+minecraft
    • 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_off0000d9cf.bin
93af0c14dc4b63b116512806ca0fd0a2046b1f01981e191975d377cc7593fac3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 10588 bytes
font_01_sfnt_off0000f20c.bin
8e50782b8384f57baedbde320bc3d59c2c5b7d62d0a82539f3e21ec59082e705
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 17808 bytes
font_02_sfnt_off00011fb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 16792 bytes