Malicious PDF — malware analysis report

Static analysis result for SHA-256 803da6ee7eb32902…

MALICIOUS

PDF

72.9 KB Created: 2021-09-22 13:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a44f8876d499dd649d4c484454bd6d6d SHA-1: eb40ff4e01483c7e4138786d39c9f1df60bf3237 SHA-256: 803da6ee7eb3290294bcbd287b011b9b0d0d0dfee492f0cd9d24554e3e90a572
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. It functions as a link farm, with numerous embedded URLs pointing to various external sites, including those hosted on compromised WordPress installations. This suggests a phishing or redirection scheme designed to lead users to potentially harmful 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://namkhoasaigon.vn/web/images/files/11253173222.pdf In PDF document text
    • http://bscartridge.com/pic/pilawolaramuwoni.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/51941898008.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/vufiva.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/14817608872.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/mevipevemotepol.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/gukejagebiwaxelizelabile.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/88523847830.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/59687892906.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/16623489367.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/rofunevagof.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614902a6cbc84---87431742993.pdfIn PDF document text
    • https://landi-bg.com/images/file/sinej.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/65254226510.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/89099619224.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/suzadow.pdfIn PDF document text
    • http://df-2.de/images/daten/file/suzexibovinewonurebezufe.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af07f47694---26897664056.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cunbkig5ostcb826n0gat3b5o2/89394541247.pdfIn PDF document text
    • http://kechengchem.com/upload/files/65334987355.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/45587528cfdaa0f015ef704a6a6b5cee/58605681060.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/nizusoxurofonofogin.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/91770832423.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/befalod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=klavierb%C3%BCchlein+f%C3%BCr+wilhelm+friedemann+bach+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_off0000b5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 17536 bytes
SHA-256: 717087a675faf0569d79a2363c16327ad7c6abb005d9b3f2c7fa29847f53c691
font_02_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 10972 bytes
SHA-256: 2b07aadb509a219671bada91d0b8f31d9c56c4e6ee77bfbcc3a6c7ff9a5ce252

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