Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c59ace9dcb8c78…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 10:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ab9d44a8a6ee82b4742cb0854e24f8b1 SHA-1: 9c35573aef61904dc693e8ff1d0a2cf853a8801a SHA-256: b7c59ace9dcb8c788014f8890e7ca489c4709efa90624094e7dfe225b6788f2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9979

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://fertilizergranulatorprice.com/d/files/95228312911.pdf In PDF document text
    • https://okazionche.com/files/19319632713.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/aff47e12991c40bbca8b5d8db2a5bf00/telufezuveje.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/17605688151.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/rojisi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b645cf239f12c4c700359e5c3b1da0d/jalowikeresa.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/guzirufukexabis.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/h4aipt1l7ulgt91ubkel1fjm6v/fifobibogofopalura.pdfIn PDF document text
    • http://jfe.hk/userfiles/sotesopewowafetomevekogu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8a7afe83---68197021461.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ace3c1a278a1b5688b0c2f0cba40a2d0/22273967921.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/92796618582.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d274baaa---timesefiboj.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/76573ce673096a3949157172c7bdff9e/14338289214.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/p9d2i2slgfdf6e2og9r7sf4reg/15681973626.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/mikifigi.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/76732333363.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f4d5157aa70d45a3a49485fa855568d4/75606732364.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/91969140299.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/tokawafelivodu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/jp7ipt3pom6vktr7b48ko6akt1/duwezusitata.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/tevuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tipos+de+angulos+geometria+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_off0000b6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A2 16660 bytes
SHA-256: bc499293482d0269f1c28efa84d3647265f91563f5581ea5762a9e05ff5598d8
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 10904 bytes
SHA-256: 42e20cd5431989d73032d74a470b93dab91e8b7831e28835ce4777b1cf4d9d48
font_02_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1