Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6ef169c3940b8b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 01:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21982ba0fb5c2e6509c3d613da949773 SHA-1: ded587af6a14a5ae547878485bf06fab1485d10b SHA-256: 7f6ef169c3940b8be28cb5049f804787793fc76905a503fb3997cc1a6e4b0e21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

Heuristics 5

  • 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
  • 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://maxlinder.com/admin/assets/ckfinder/userfiles/files/kafoguzitumunuvilox.pdf In PDF document text
    • http://nature-revive.org/files/file/voxitavorupadela.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/tefenopumafu.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/wudex.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/jafejozesu.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/46000738893.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/3067297394.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e251382f62---21223469660.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911210304.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109152012252260564b0nuu.pdfIn PDF document text
    • https://badrivishal.com/media/74448866627.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/37557409712.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/1505901531.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/femopuxelas.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/deramagevitamegugazan.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/86161325959.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8bb941694caac0e335ebf30b3899b890/63261803172.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/nuroxinewularogu.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/8969880500.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/76772587785.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/teferuwugosemaxinigasaxa.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/m5en438u1ujvfpc7452umjt7pf4ko8j3/negilefojitatepij.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7d6c9dd25---pafamel.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/36397369192.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/47680448200.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/34851552035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=instant+apps+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 18324 bytes
SHA-256: d224ecee7d6747c73839b4987d781d2295d23a4dfd1f1dcf32b3441832375708

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