Malicious PDF — malware analysis report

Static analysis result for SHA-256 1035b3cc71c9adc4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 17:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 997ec3c53e7c4a457104360320feda96 SHA-1: 974bf34f76bdf880c1bd569104001a03894c6035 SHA-256: 1035b3cc71c9adc4ef4f8c4bfc64faad55de26b7b948de7a9075360d3f436a5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/gozenopisefinovodamosu.pdf In PDF document text
    • https://granitabrasive.com/editor_up/xobajadaxunokani.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/risepezafulubitefora.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zijimitunisovif.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/78147702824.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/82999571429.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/gubexupor.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/77134321472.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/29461560868.pdfIn PDF document text
    • https://shibbirs.com/media/files/lewisunuvimuvozubozuna.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1b306ab9e01b847fb2436e42796cdd39/duzikofixufojabuju.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/mazesorupazuvape.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/karokerefaw.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfbcba9d3---5722224260.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/398723c56433b17d62e35ca3e6cfde7e/91530997623.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hs44uievb0ldla33v6mjp41ua2/28124655960.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/kifixuvotu.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/xufobugujexubikuwuw.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/29003287512.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/muzudekajogiriteje.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd507716f---49032930566.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zamire.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/gadozin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=idle+courier+tycoon+modPDF 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_off0000c5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D3 10364 bytes
SHA-256: 31c0b33a91ae4c3800c2ae438edf0a99152ac823fffa21fa8a9965f645ca29fd
font_01_sfnt_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 17312 bytes
SHA-256: 6bf4ccdd0178467acd5761c1c95cabc65dd854b3e69cbf8b1e2f9de13d1f13e6

Open this report in the interactive analyzer, or submit your own file for analysis.