Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc71f94c9e595c61…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 00:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7ab019ac20714e7cb003f7976722634 SHA-1: 9a8079d51b65b58d5b4ce8a1c2c0d3cae82c7dd3 SHA-256: cc71f94c9e595c617c409bf9f34c761eb44f6787b3e62e50d4eb48442f88c09d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with at least one identified as a compromised WordPress upload directory. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.pvvc.cz/files/wutozu.pdf In PDF document text
    • http://gesundimjob.at/images/content/files/31069837524.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/befobofagerepuxipana.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/musuwexituzuxobuwo.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/65693733857.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e61fa0b8b---xovexidejege.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/rurepiketofikexolegepum.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/niludidis.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bojoserikimepigabaka.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb6d85b4f---78529268701.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/gaxogegonadukobepetadal.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/taruwefaf.pdfIn PDF document text
    • http://technocom.pl/editor/file/19783530703.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/e046ea7667640ac71cc92abb0007d213/65200953313.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/32097720179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hip+exercises+pdf+arthritis+researchPDF 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_off0000baae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAE 10540 bytes
SHA-256: 27b48efad1aafb46bf5fe978dd0a4ac940836530640250a7899ac886152839f7
font_01_sfnt_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 15684 bytes
SHA-256: 7fa75442a0f696564f370105d46c274f7a65d2a16bc7ac385d8225e2ed452323
font_02_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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