Malicious PDF — malware analysis report

Static analysis result for SHA-256 586e947cd20502b2…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 05:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e51a12343299bdf2a587b466f8ff0a81 SHA-1: 0fff4d8744748f6f9d7869d256f4512c3359751a SHA-256: 586e947cd20502b28667094387aedfb7d037ff9fa9c141cc22268093483122da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=bangla+choti+golpo+2018 PDF link annotation
    • http://escuelasfutbol8.com/docs/files/witogila.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/danad.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/50165664068.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/lomivejobogitizabaxuzusil.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/wawekiwuburowubutifuted.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/buluwozuxadagavapejukep.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b67bfdd28c---79741548878.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/61776398760.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/5397175449.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161336aeb59493---suvowutovemopo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xawutovepadoluvegi.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/nafapapedavavuderebuwoji.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/65435723748.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ba5f358dcdd5cde58de0bba9a0f20e95/74966722714.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/gidekaxilagife.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139df2650704---24993318699.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/zawiluxi.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c78c995036b40cf6309d1e769c7acf8c/nisozomo.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/ditidivasabad.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/14c7dce1845b3f58699c3fa9a84a6d72/namuwowokugiduvajavudi.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/tutedu.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/nubekegej.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/dabojebugopedadulaxaxe.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_off0000b004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC816 17104 bytes
SHA-256: e0f6a2631b1c57cc366969a0148ff43055a72c729cf4ff67762cd430413f848d
font_02_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10808 bytes
SHA-256: 035db9572b8c23d31068c070e1998ff27d6f9f1d220bf7270b2aa94a353261e3

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