Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1ad4a5e71d3aa9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 06:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e25fdf6b009e774612e8d77304ebfc77 SHA-1: 925b5e3abc8f2201371e98efcf2b180861856a56 SHA-256: 3e1ad4a5e71d3aa9742017a833243d6f0ea72180ffd5fd8c39d09e379e26f378
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088084101dee---ziguragusefid.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b483bb08e35---tesujalosidipiraxopos.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/69346848474.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/gifodijetasiwizowawexeg.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160874d76a5144---55283298725.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/numisineboxomoxoxedupetag.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/pelixutiresalogokidit.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/niwolok.pdfIn PDF document text
    • https://cargobull.cz/res/file/57028981336.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/pojiwegikinixegadefufekin.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a002cc499073d83cd9b2d6dd17ea229c/tewepedumo.pdfIn PDF document text
    • http://rurisnet.org/images/file/16668893080.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/wumuxesidunutifixuti.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/u38ap9ju5q9nnbvnru39l0qq95/57545590573.pdfIn PDF document text
    • http://dothi.info/images/files/woporu.pdfIn PDF document text
    • https://giustofiori.it/file/71873383784.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5f7600f8b08ce0f380708b9eda6131cb/22362171372.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/27151806527.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d742a8c80d---giguwebakilegiwov.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6b0c5f4a5---lijesasomusipum.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/9153240858.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f83a01c3b---85101850339.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3699f2694---depepebipovuten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nccn+guidelines+uterine+cancer+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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 17832 bytes
SHA-256: 1c4d7491413dd932ddcce9f4d0731ca9678276e4e824b220ae3321012c27be64
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 10752 bytes
SHA-256: 7643cc434f8042df5245fe73580ed4ecb8f0066c58e708b0f0383a25f3a76d8e

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