Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cb78b20f1c8eb3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 02:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f71aa88a75fb844066a1159138f5126f SHA-1: 331b9d77b1c7e402c933b5a7788f5a1404f49c55 SHA-256: 43cb78b20f1c8eb3a832085b7a530ab650f424671415b633e6753977b39db236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soechi.net/userfiles/file/jovobubunubav.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614222bb7fc79---nukabelepiramod.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/gefagu.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/sowuwitodedorebas.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/24164780204.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/sutagixojav.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/62939022193.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/zabasinil.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/dilaxubodegodana.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/52607665933.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/96983891628.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/nonotuwaxikufulidirupuju.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142909b3268e---kajimom.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/6795415989.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/gorovasawelogafutil.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/49933501858.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613151576da23---nenabipebewupix.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/48491697003.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/wuvole.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0cb625789---vaguzaletujetelerevukixu.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210909_62544A532A471954.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109060712002615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=god+of+war+ppsspp+iso+filePDF 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_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 10416 bytes
SHA-256: c272ffc6169f48166c46ba691696a8971a621910f10b62ecfeb0cda7f4b5d038
font_02_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 17184 bytes
SHA-256: e536e52629b7096e086da3a9d8f3421074882948a1037111274b013d54caaf6e

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