Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df5f16b35fb9355…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 09:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53fc74ea2c565e862118eeaa52522dc2 SHA-1: 564448e0747b280eebafed807761d660835327f6 SHA-256: 6df5f16b35fb935538fbd18c41904b9e110262e6107efbb7bf24ec1e07236ad1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=wood+carving+merit+badge+pdf PDF link annotation
    • http://anhuicrew.com/upload_fck/file/2021-5-5/20210505190120619242.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ea1d856b---63065729759.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654b83dc18---vuribunejofodoli.pdfIn PDF document text
    • https://sanidom.pl/img/file/74575524584.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a408ab54079---kajiba.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97b3273c3---lufeva.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/12508589313.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/32227833977.pdfIn PDF document text
    • http://deauville.ru/files/file/ruruvuzozidodisutarepo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2235225516c05e5fe8c140c75e31eaac/koxikepelifajizuzojimeka.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/r5rhbnjho84hm39p1sohevfo34/45186231225.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/remawutoz.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/rujamusomolinuni.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ec35ddf45---siteturalifun.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zokitelidubirujatuxitexo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df447f8b55f---43063191772.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/43851162480.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-23/20210823191846176507.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/biletevobig.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/padavojakob.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/6126670169.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/94682337439.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/jelavaperiwog.pdfIn PDF document text
    • https://digireg.es/upload/wogozawugazel.pdfIn PDF document text
    • 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_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 15992 bytes
SHA-256: 4cddf2a8c3994c4b0f938b0e4bdeda80a361d7d9a9e44b5aba15cb544723cf75
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 10948 bytes
SHA-256: 08347ff39f3bfa07f66de3e2ee8a981d8959102cfa16507d387b76f72e703ac7
font_02_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.