Malicious PDF — malware analysis report

Static analysis result for SHA-256 977a1cff37c32026…

MALICIOUS

PDF

91.5 KB Created: 2021-09-08 22:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c872c4bc4ae196de672431f2ee2b4b1 SHA-1: 70a6c80d1b683e4d71c147367f9565438167e4f3 SHA-256: 977a1cff37c320263fb52aba058a423692c9417fd713e58b1ad79aba47d7e515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=list+of+boruto+episodes PDF link annotation
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/80897434241.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dapurulematetenasubatug.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/55566144685.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/21762769117.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/mapagijosuxe.pdfIn PDF document text
    • http://fxlcd.com/upload/file/dogat.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c315f41a8---79763392343.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/luterip.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/477906887.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/mupepotolijovabiz.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/61490182760.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d7525a70ed9abb50543211e6e6172edc/kegarisepuzotupajanudag.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/78245181548.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/gosuxejasifibikajiva.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/kisuzefujo.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/83720898887.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/77468889847.pdfIn PDF document text
    • http://partnercable.com/files/wopewowakiwifoke.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb3f5bdd2---96216872162.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/40238471558.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/vivularazifamamezuvifad.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/ruwunemawevaralavitin.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161305309323d5---vopuxeliduju.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fejozukafelewimawivi.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_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 18080 bytes
SHA-256: 6d226aa3f1a7a614c981552604e7d236715296b75d70f84498fcc118b1708d5c
font_01_sfnt_off000130f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14910 10376 bytes
SHA-256: 9ba869f9ba27961b9f347a3daca2978e445b9a654254f12d11890023e66df5a2

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