Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5f21d816f17f5e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 02:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: d31c3d5245f8eb7aa84dbf1e814ba878 SHA-1: 57cde7320ef12e937e23d0e7a82245ffc0135908 SHA-256: 8c5f21d816f17f5ef464839d1cabdc08d3c32479be6d1475aa08e60f8ec31548
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ayurvedicclinic.org/userfiles/file/kumorelixetaz.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7e1ba6ca6a696d647f4dbf143b8c9784/kaguwe.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/93803846804.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe79d5040e5---4095267945.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/48567541598.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/letedazenixo.pdfIn PDF document text
    • https://roc.mn/uploads/files/67410470789.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cf6e3b9e9eae1e82767351dba9dfce07/dimifawumuxuferowezivov.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/wuwuwilikixumazimi.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/rafowurerovolitizakeru.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63fec09dbd---manaluxozodiwosenokake.pdfIn PDF document text
    • http://bociany.sk/media/file/jigiluwawaturovoxavifam.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f4f2d1f21b707221e21d242c9e07de1b/pedanilikipuvulafarerewoz.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/13244600069.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e049ce11b733ee5c6e7296d83c70448/lelezov.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/12276930718.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/patadubuxozas.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3390ca9d8---rulekofemabo.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kotitapekepaxep.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/rirutazaririrode.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc18c3c61---71821406860.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c177e37af9a---xifojenidilazonogudube.pdfIn PDF document text
    • http://nordavril.com/userfiles/file/tebebudajeminokuj.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988512a818d---26076177230.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/39042201359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lorica+of+st+patrick+pdfPDF 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_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 18484 bytes
SHA-256: 7e5625b27b40dfaeaa7fedbba0e3472b62f2cda041fac3a7bc5aa59785552afc
font_01_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 10380 bytes
SHA-256: b073073fd9ad834c8776f5ea29f62b3223332b16f214314d19d268514813d95f
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1