Malicious PDF — malware analysis report

Static analysis result for SHA-256 218371dd865adc97…

MALICIOUS

PDF

82.8 KB Created: 2021-08-15 17:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b35dbf2f3784ca084473b5017d8b6a17 SHA-1: 0b5d2dcbd8edb15aaff23914c422e57a7db2fcf8 SHA-256: 218371dd865adc978aebb5e5e7d28efe253824628f4f7da3fde55b64d317351b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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
  • 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://huntic.ru/uplcv?utm_term=como+fazer+vida+little+alchemy+2 PDF link annotation
    • https://techson-cctv.com/upload/file/muzobujilejixodinobiboz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ca411f97e31---7809425137.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc3081c03---42909541026.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3892dce6---57193467459.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/tebudafe.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/tutemejopalut.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/wunigowoluli.pdfIn PDF document text
    • http://philboyd.com/nabadisowegu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/74880358358.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/gujog.pdfIn PDF document text
    • https://breedlife.com/upload/files/fomineka.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/78f0275ec3a4eba1525ec170e1f7c7d7/finiboga.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wuvudeneral.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/vifobumejem.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ghqapv8s4abh1pi1l8ombs8img/84345544763.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e659685eecb---77878502969.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c9fd3d4d---30571473833.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/47459238717.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a23eb31d---22166236988.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/23111665571.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/10095026039.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608644df6414c---30227639944.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/db103b16661c4d55155df89d6c088fd9/rowupaxupuxefujogorekomo.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/68339546342.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c648eb5ceae---jotejekudivopesepode.pdfIn PDF document text
    • http://goref.ru/files/file/vagakumajikuzafu.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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 10860 bytes
SHA-256: 519fa6b74bbd345d44902e3d78dba137c14056fe08ae095072c4a9becc3ec652
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 19108 bytes
SHA-256: 6a82570ceffd49bccb87618637990ddcb1c10c2c527d3904be54ad5fa970ef36
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.