Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2835b3233504a84…

MALICIOUS

PDF

119.0 KB Created: 2021-09-08 12:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c3da64942d95db711d495d14288dfe2 SHA-1: 3ddcce3d97522731885208f45e090cd66a2505fe SHA-256: b2835b3233504a84e514baf8232eb42153aa3a918dd7f423c1dbaa761257f657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a139bdfe---50200490646.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9345fbce5200c228240d038059723a36/11772304684.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wugupowofidako.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/0e516c209a47c1a7ade666610cf85ec5/14650468244.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pelawul.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/cc8c7265cdc3db145a771d6ad39be9dc/94010879229.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5e57e69f5---64854287765.pdfIn PDF document text
    • https://digireg.cz/upload/virojolejika.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5bb4810bfc050b65f3853396d4380a78/vukitotun.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/ranomiluvofonoj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b53d55f4---718919137.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2618713da84f6e34ba0896ac5d6f37a1/57014457707.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/guwefo.pdfIn PDF document text
    • http://szwygs.com/upload/jorebur.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083917b593c9---31859042652.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ll47piuns83lr7ns20lam70eh7/jikifanabufesapa.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/af3ba81721907cc45b1ddec9d851f7dd/sitapovu.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/6655601611.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/370cea7d03dd7392a06c95a2953f6d83/kerisetefepakojaluliwubin.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/13662519764.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/kidebe.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160857a2154e9a---85071369281.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/idndt2k0ofg3phrlk2vtjm6538/fenexojipog.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/busivami.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/napokevej.pdfIn PDF document text
    • http://podushka.by/files/files/korujegevitevaneladod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=platone+la+repubblica+pdfPDF 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_off00016832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16832 20312 bytes
SHA-256: 7828195835de4bbac0e4183c61db4bf3e4cd990d2f6e73020a0da2b74b5d6a2d
font_01_sfnt_off00019d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D7B 10684 bytes
SHA-256: 23e7f356b823dd68dfd884d497365faccaceba512aeac317c014561b21a8c1ca
font_02_sfnt_off0001b5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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