Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a9b02d0d5da3eb…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 22:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7dd7b002c758e9b8ce61a293e48e66e4 SHA-1: b379f552746716a329f98e1b9269aa080286a1f6 SHA-256: 88a9b02d0d5da3ebf76d700fa7ffdbdd7a64beeed37bfe46980c0cce6a35a847
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2401573891d5ea918682670253ac3950/50820657830.pdf In PDF document text
    • http://americandeliorder.com/uploads/files/nixasuvibaseti.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/wusamaropafud.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6svekr4n0jkre8snogft3mj032/fatekagexofenob.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/rifixifisofe.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6b8c4ff1---25955128782.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/3232289702.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/wagimomi.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/nifoguvegibobegisonugolom.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/74042492737.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/gibesi.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/gobise.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/81479248554.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/5744762153.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/risovewixumerib.pdfIn PDF document text
    • http://apsons.eu/files/file/18287987582.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/31618550184.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/1138829154.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/3498591269.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/52315002894.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/34505481935.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/31509060595.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/tetujoseseg.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/wudezavuviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=font+color+app+for+androidPDF 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_off0000b0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EB 15100 bytes
SHA-256: e14b7f0da30ed44494607e7960340b5c21f3f87749d04d2216b1e05f460b866b
font_01_sfnt_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 10292 bytes
SHA-256: 92565b8aa0833fe8cdaac3882c428662d3ab7a0ea35273bc497e1c4103a499bf