Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75522f087aa7aa5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 21:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72623f259dd0b3e03f7737c17e82831a SHA-1: 5f5e61a3c4df937b659198317d5f05cb75e3ab12 SHA-256: b75522f087aa7aa529577b5c86fb5d02903afdca167a38012bc6fca06cb5d0d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=autofac+electric+dreams PDF link annotation
    • https://produktybhp.pl/pliki_user/File/66345599178.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/70016138968.pdfIn PDF document text
    • https://masihpt2.com/contents/files/biroduzalituribi.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_140102.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210911210109.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/majudatidelifar.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/sezasajobefi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161442b8f7a070---tegepopenagixiz.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/mafekosegojuz.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/96303673647.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/26425467532.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/61685179588.pdfIn PDF document text
    • https://rjpexport.com/files/kowekerebagewike.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/74650415622.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/nenobaraxanowakotew.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7a90c97abb002122967df1c76bfccdeb/gitenepe.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/4793550560.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/gefulekeguvu.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/wavawisirobozo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135074a3f40e---dadiwi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fogamadiminapixutagowike.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p5uj7677n75ij0pt2t5ojlodhf/towotibune.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/zubajurevoluboxitet.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/52645334532.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4fb7218b7---xojopajipitatef.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/supogojobewil.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/banegokuzabamumajotuwiw.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_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 10616 bytes
SHA-256: 5e09f41f1cc7bdba8daf76bc74fa1f499febec03057a4300594d551c59e94911
font_02_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 17980 bytes
SHA-256: 499b82803e211000c406743f9c9426b0733c44ac1bd5df6dad99aeb57a41d49b

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