Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb342f9551a7cf66…

MALICIOUS

PDF

88.6 KB Created: 2021-08-22 03:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1b46bd363e3d02a9f2179e1a4293bf1 SHA-1: d5e09631818f82eaa361e783f922e3ae55460f0c SHA-256: cb342f9551a7cf66f2c4012b7d51ee0e0424c959bd7f9b1f6513e8b627694c7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. It also features numerous external URIs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support its malicious nature, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=pelicula+de+shrek+1+completa+en+espa%C3%B1ol+youtube PDF link annotation
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117f46ac39fd---25228527470.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/60246093961.pdfIn PDF document text
    • https://bem-sa.com/img/file/53298859524.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cafbd7b53---fizuxejotenufira.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lelilib.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/88140635201.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210807001222.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pisokf5aaopn64739gvalr2cv5/62299399372.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098adf21b40b---dorutufarolope.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/5969948753.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/rapevejivizo.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/48063227975.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//56735884396.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/wizadibabozakera.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/2885751209.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c209c5375---fakejurajubet.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210805210019410.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba9b564e53---17971764740.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/38cc89c382b9980f7833f85d6dc6312f/12656670498.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8226e4ac1d06bcd2c00b4bef89f27f3f/zenubir.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/96662480139.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/kovorigugawan.pdfIn PDF document text
    • http://bulmarconsult.com/files/53845359070.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/bebanegobugokukobosobavu.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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 19052 bytes
SHA-256: 41fa3ba8827b06a9c02e4ce710f163e7169b0ad29fd3f60b6ba9c92ee1d69d2f
font_01_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 11484 bytes
SHA-256: 9cb8cd2687148d5f1dec02cc539184a8a1f06435666078851ad410edfef57334

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