Malicious PDF — malware analysis report

Static analysis result for SHA-256 152f5efe3fb768d0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 09:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 226b55c7dc5b980af4dfc343c98a1dc0 SHA-1: d6cbb71876a001fd9f06a987ed32f08bffb5e79e SHA-256: 152f5efe3fb768d00cb5f891270aaf27592cf08e62f670e0e173d52533b2c5da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=resina+epoxi+manualidades+comprar PDF link annotation
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/dexokatiwusudiji.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/wovivuxudigokagarojub.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/p0158e5lutj3oa2k2o5bv0uks5/38665813339.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/etdo18frqbpm78cn0c4u6s4c5q/zawelixetogevud.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b209c37532d---71274637379.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/8934767167.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc11a88a1---noxumogin.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6118c0486effc8902dd79e8727211e31/diravafakexapinobomuki.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/gawotamurowobavifufu.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/manimaferar.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/97e06c2d53e5e02d133027f185732008/zotetine.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210606_013508.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/7307896211.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/84221579453.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/marokasemajajifexa.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/13705671637.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/m1775rkuat73p4rffpv269hr64/14982115050.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dn53fnkua7bra0k8c15fselgl7/34430560471.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e482461b4f1---rigiguvupedewuwofiraso.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/40426711012.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff5a960e2---62663563829.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/27657200201.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/befodaragajeroxadukenuzej.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ac3d05aefb41e1db83fd132d6e3c8798/xarovexugorudazeborimid.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7aa333de---pitovab.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_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 18396 bytes
SHA-256: e36015ec6be8d772c8b8875db04df750c2527f78a0c7274db02971ec03d26a4b
font_01_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 10824 bytes
SHA-256: 9a331579541888c4ec45a6c49ac2dbd042030bd1a3b7223be592031b70950d02

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