Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b20db56b6d357f2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 14:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 409b7db601814618adec67cfaac6559f SHA-1: ad52a1d3cf5acc7d0ccc059811949d25f5456528 SHA-256: 9b20db56b6d357f2535c0b05aa89aa3c81ce2cc2b10fdc61f87fa388c440e055
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://china-glass-mosaic.vegner.com/userfiles/files/20210902_170236.pdf In PDF document text
    • http://yeongwonenc.com/userfiles/file/kesevaradajenike.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/94365958099.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/63740193550.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/97462702622.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/df34580720021e6945d0cd239b3d8b1b/rirugumem.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/99991600929.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/zivojupapezazew.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/66923110231.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/26917254384.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/xidijinaginuzav.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc06723d8---62865547849.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/lififanupi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1a8a4071ac468eee2c0a14523849bfa7/87643500551.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/83100453277.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kabuza.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/mujodidaxeledixusuzutome.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_395EBAC983F3DE3E.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/12209683736.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/94897299974.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd43294bed---33432087177.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/liputuwig.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139622ce3d5d---80328263931.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/69872176935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lmt+launcher+apkPDF 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_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 10408 bytes
SHA-256: 5603d3082a643f375f120a8740865f729e48ab86d2e33fd49d8007ae0f03ca1c
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 22212 bytes
SHA-256: 7934459fccd2f3c1179290aeb960af779eaa92ee1fb5ddced29e99c067dcf22f
font_02_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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