Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd65615c1b5d38d…

MALICIOUS

PDF

81.2 KB Created: 2021-08-27 06:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49880e9d7fd3476af26640bc99138cd2 SHA-1: 5d3056899794b1639b722ce2ec94172b02501b3a SHA-256: 7cd65615c1b5d38d38e68f4b0290f1abaa962aaa22b2fac3456049ed5a9019ba
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious. The document body was unreadable, but the presence of numerous external links, many hosted on potentially disposable domains, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ded95b034---34392072454.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e09e1380d---26729487799.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f400fb09ef6---27577285600.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vhhdo7m70pg8mn8p90d8jkr4fi/lejedosa.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/pulowubus.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55579dc1d1---28645604239.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adf37d9ea26---14757764266.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e563b18d2b---57104773858.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/jimijebogurutonuruxor.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ebdd33dabf7bb91cc0c27ecbbe1ee99f/vufarizeneloz.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/zesalipapemekusodesiwovi.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/jinaravujap.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210609174525.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076126d558d9---sirawomuwulajijawisufa.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/kukolivitopobatanigosireg.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/767b0e56e62bc2f82ae3b0d810461016/52629742554.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a479bab72c1---78600350280.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/wurabefinukibakilufeguf.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb9225c894---91843579060.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0fb74ecfac05a62dc62cd8716629c61c/13203021485.pdfIn PDF document text
    • http://18554080.com/userfiles/file/99430449603.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qfu46v0m2os11o8btedltmo7ov/mozejirezerudetixipateg.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/vuzebujagisowenuwelelu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kvrnbp60lvssabkdvk6csh1476/mejojekipikaxejesogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+does+vouch+meanPDF 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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 10556 bytes
SHA-256: faf99c6f9f5d1302756e6e62880939453b4dcdedeeea251a5ad8d64668455d89
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 17520 bytes
SHA-256: 2056b2c427f258034b65cf82a4ce6fc7d06e9e61d569dac3481d7433c9cf0f96
font_02_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1