Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36a0e47cb1e1cb9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 23:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 180508126ad115d76076e5fb91830e8c SHA-1: 5de3059b2c9dc3af4d2d261528c078852a018412 SHA-256: e36a0e47cb1e1cb97ba5bc04ca2d50305d9fca92b394036b5787e344714b2c84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=enlarge+eyes+photo+editor PDF link annotation
    • https://privatecambodiatour.com/userfiles/file/4250118973.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/35306996427.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/xazubowinuj.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac16671b0---mizajijizut.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/33265582506.pdfIn PDF document text
    • http://offerparts.com/upload/files/romevofibezuzulaxopopov.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/jatinosakadojexenijotu.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/7480201505.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210915_CE27C950DE39B86E.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e4e2fd50---35051186222.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/77436588194.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/53627282806.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/24856487294.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/61214713151.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4a03c2a49551bce3e5126994836574ff/pawarinuwixisebilojavim.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210905004916.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/bagutisekogojige.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/rosuvuxegironeg.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/kibavaziwurun.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sifesawobibenuveta.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/15349835534.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/77157537653.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a2b64689e3c71be5dd84a211aa235bfd/napaxibonovajusa.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/gadipijokax.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/sadagikunogudoju.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_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 10768 bytes
SHA-256: 2eeccaf26970a5cc7695373c5e188d46790542484792f8db3fe8ce3e893b8b43
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 18048 bytes
SHA-256: 982caf37a13269e87a9cc23c3e77cd1b7d8ddcd5e93d90eb447e90172e687207

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