Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6e5a74b8080d2b…

MALICIOUS

PDF

74.9 KB Created: 2021-08-30 11:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 14728ea8aaa6d09b0bfa9b72fd9b399e SHA-1: 791a9c4ea6009c480f4ac83fea381c9a134c2a01 SHA-256: ea6e5a74b8080d2b0b36a0e30ba7f68e41cddd3009b985f9902fd48cdaecabb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://beautyyaurient.com/editor_upload/file/6851836684.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9f075b9b---15212531734.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/juvujekezusibe.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fv0ujq7ego9shkhgab0ir0gns0/90865229708.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607212a51b762---zuwiwapulokuminoloxe.pdfIn PDF document text
    • https://jss-moms.si/upload/File/pupeb.pdfIn PDF document text
    • https://bagstyle.uz/images/file/42543955286.pdfIn PDF document text
    • https://serka.com/serka/upload/files/zosenulupozazikisub.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb51cd01b---balafukivumez.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/mawatiketikazewi.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/64813147820.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/gopubuz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090af6195040---wawenodebu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d356c26a5e---pixir.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077127ed97e1---mesit.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f40a9404d---73302128087.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xikosojokezodib.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/414946039.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/srmsr8tf1098u4i7svdm8q4uni/81558146178.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/mobexejizarefavutujas.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/dunebiwebo.pdfIn PDF document text
    • http://3q1p.com/upload/file/2106130819280878763835uttzjikw.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/jovoxubijofibise.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2c96bb44c28698be405727449034cb51/12571954619.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nlehbkauuk3tpptcdajj2meja6/gawiwokawirimuvorelesojow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=prepare+a+presentation+for+an+interviewPDF link annotation
    • https://lapdonline.org/file/94542486618.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_off0000c1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A6 10456 bytes
SHA-256: 0386babb9a6b0eb6c6759ced0f68e8f38f5d94c3c5a34e617a89cc0265ed17cd
font_01_sfnt_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 17356 bytes
SHA-256: 7eeb426690a60c105304bad8bea8c6e134980c55c9ac22446be7f5aec4ac4867
font_02_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1