Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaef9c44ec149a7…

MALICIOUS

PDF

88.5 KB Created: 2021-08-13 00:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ef3a6734e062bcf2ccc0159e60c86469 SHA-1: 12dffc1ea23fdb5241dab503a1bfacc7dea82b21 SHA-256: fbaef9c44ec149a77d2e0a00003792ff032c8534a80811061cb81a7c1fb0d5af
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/d8amsorkf4uvo1isg59t2ote1r/wenumereborig.pdf In PDF document text
    • http://burfel.ru/upfiles/files/suluxodirojomavotoj.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/p3ih4rt97092gbs5vcjj9397ps/50209323807.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0a81c3f36a331dbbe725bb7cacd186ce/60246537321.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/zomarapojulafizutakevug.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/61881977117.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f9190074a2426288014f104c0e2495bd/93577134042.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdc1ce5b75---resajubunen.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/357841aba96dd85b008464ab60cbdb2f/zebudufubefibufokete.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/roxuvovomizobefal.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd29cd0acff---21795696128.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15ed22568---4843955716.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/texofakiwutitukajoduba.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/86fdebfd28829f5d2c4a3d19d5ac6646/kezanopafarikoji.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/gijituzikeziw.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wuwadi.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b770707c629---gaxupalufilawuvenosu.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/vumati.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/xunukupujaretaj.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/puzomo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/673a26c8a80fe4d254f4166212abc71a/zezanojinovesugedidupew.pdfIn PDF document text
    • https://mauspro.net/upload/files/94569619936.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/17792653992.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-02/images/files/xulasonejeweleg.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/28024565014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=titanic+2+el+regreso+de+jack+pelicula+completa+en+espa%C3%B1ol+onlinePDF 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_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 18416 bytes
SHA-256: 396efbefd9c095c69dfbbe0834c20f3eeb411871a8f1a340007f9c07ce103b4b
font_01_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 11468 bytes
SHA-256: 4277dc200da9a3930cb3bc6402f57f83fd9ebf73ac500cd92e1642ea28621d5a
font_02_sfnt_off000138af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1