Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cac3e650ba3b96…

MALICIOUS

PDF

168.6 KB Created: 2021-06-28 08:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 005472279b02df8232762619b3cf7de9 SHA-1: e4bdae22ae5cf32fb2005149a31afecc5d673c53 SHA-256: 23cac3e650ba3b9658ca0472e67d9357b05e7c65253621f02477700cabbe4d50
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/31071047542b0b8ae0ad5c80b3d3167a/80574746825.pdf
    • https://sluganarodu.org/userfiles/files/vodakelazefuwigojisizutet.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d8be37657894ade2ee3077f682efd36e/wizesijunukematutedo.pdf
    • http://ndt-tl.ru/upload/file/93121345683.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7mrk39ofievi309hiuv1hdsku6/50655759300.pdf
    • https://arerp.kr/data/file///43124837695.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/da264d3dc5d09bb03287d6711f206a38/16841220813.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e61e299c6---72066597122.pdf
    • https://digireg.se/upload/93911960619.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c931fe3413---rukuzoneb.pdf
    • http://poorclarescork.ie/images/busikekudizateb.pdf
    • https://soechi.id/userfiles/file/25146030702.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76a643e70---segasojes.pdf
    • https://studiovizia.com/webroot/img/content/files/88593735017.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6a6f5c0b63fecb9062c89723f22d6993/98808460060.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/afbcd840dc39d7f457e79613be73acdc/ximatozojuxuzakopavagewu.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/u0c9rmq5h0crjqf81cf67fi7u9/2525310418.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8386f9a79e---95324427153.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f06081fad3---53238847863.pdf
    • https://tortugafilms.ca/adminfiles/file/99720074699.pdf
    • https://alakharia.com/public_html/userfiles/file/nogepositi.pdf
    • https://farmaciasacoor.com/site/upload/file/bowifipepetuwul.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afe19e32c---89977036861.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/fcfe9de39d3b408b63567817984dc2de/88997351851.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f5423b80---14434447207.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6aeaaec0---11468527721.pdf
    • http://zrdb-drogbud.pl/Upload/file/75853461394.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=english+worksheets+for+class+7+with+answers
    • 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_off00023119.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x23119 16792 bytes
font_01_sfnt_off0002492b.bin
fa6dffcb23fb902de0d6225aee3031878bc3cc71d8590eb4efe86377ec55937f
pdf-font-stream PDF embedded font (sfnt) at offset 0x2492B 18520 bytes
font_02_sfnt_off000279a1.bin
5e7063d42823ba6d12541595e93cc8e07ee318304a90bb84ed8f95b46a4d41f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x279A1 10824 bytes