Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cbd0bbfc56717b…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 17:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2f751180d201394792b619480845e6ef SHA-1: 5bf3d5d26cec532fea1825e29556598a88a6491e SHA-256: 36cbd0bbfc56717bab51c5972b0c33df67b504318e6ca2de24a7605f063d7e29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc74d71f50---23309717499.pdf In PDF document text
    • https://fototipia.hu/files/files/ranakigiwafuxitemede.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/malomuwobu.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/69071093706.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/79419190214.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4767f96a9c7e4455c0d30a34ff74397e/tunukisekajaxofo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xigesuwokimatozubawazat.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6150fc6442d24ee270b20cecd1adb12e/zavopesuduzukovobaw.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210526115130197.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mc7s7rtqa46340j3g5n4kn4tvv/nomenamolakurexifugifil.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6308c520724c01b4c790c03c8ac8de93/tijus.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f808ecfe3b---gevipegenimomodotu.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/73214025227.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf993448623---13517443859.pdfIn PDF document text
    • http://builderall.info/userfiles/file/90978317726.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/filajixifadavonokazaguw.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b1504968---27555910120.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/97941091245.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608799b18ab07---ratezewin.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5839cd35---kirerawod.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/dulebukofuzi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160db977eecab1---49349409274.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/digefilumazov.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/71049274199.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/lkgdtm2g9rhir1pigg60sodjni/lutoruwubuzusifegozakeni.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/26492652166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=singing+group+synonymPDF 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_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10444 bytes
SHA-256: b45f0e20f4e1d27bf725c0e7a9e2519d07c80db80b62dcd6ec3a2e76c3078bac
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 18716 bytes
SHA-256: b6f858da80bac73f800585ebba9fecb918551fd85b6b4758a6d1585551244fa2
font_02_sfnt_off00013771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1