Malicious PDF — malware analysis report

Static analysis result for SHA-256 adae91a965d8754a…

MALICIOUS

PDF

80.1 KB Created: 2021-08-23 16:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f760f2f2eda2012c471ea5240d785593 SHA-1: d8e4972ef28dee61f469c913c31c37d628563ebe SHA-256: adae91a965d8754a0d2fa70ca93dd324c510cbf271824a352b03d095549f510f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/44uhkhljfj0ia0te8r3g9l1edl/katibovuri.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8afc892e---79090989717.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b359fd4f97b---61924666361.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e573737---rowowonawuxozuwa.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/94622509287.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/99518791027.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2d3d5552131db19e87eb469405a4dd45/jadumowasijegolin.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/56099062061.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/67052520716.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23d6ce7f46---87120629892.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/60577821574.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de959a1a79---mowuxupawebinesugenesifi.pdfIn PDF document text
    • http://abnicum.ru/files/file/zonerirakijopivumosavow.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/4829362850.pdfIn PDF document text
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/450570593.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161043ab7d9e79---94914376363.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8bffb92de---39892893801.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/19771618943.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/gusidofaz.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/fesubovosuk.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/nipewuwo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161142b73693f4---mewomodekexonajubi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086707ad8b94---rijidunagexupifefarej.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/pejirexe.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/rahpbgkrvil9rkd25j914egf21/gaxenajukasipirevo.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/ruzebebiborev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+ultimate+f+suit+xenoverse+2PDF 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_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 16752 bytes
SHA-256: 9a87c6458fefe73b984251a8359bbad89a19d6fbf1114252dcc8a9a74183f78f
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 11024 bytes
SHA-256: 9df459be4631cccc4b25215d665a5cf3320f09f47b8adcf6235ed688e6305c11
font_02_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1