Malicious PDF — malware analysis report

Static analysis result for SHA-256 a697b1e460e6f64f…

MALICIOUS

PDF

133.0 KB Created: 2021-07-23 05:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 540b44760998974ae52abdbf045be74b SHA-1: b0e7ed2907936fa8531c4db7ae100d311cede25c SHA-256: a697b1e460e6f64f6eace8389e011b150d498c73b1db41d5ebaa56df5c5f5e5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lure users to external, compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://insureavisitor.com/userfiles/file/polebumiru.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dmf3651op9jj0mfr51pk4fu2o7/56822942226.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/1135480749.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a774f41c027---38575015350.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210619221457.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/30600774762.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6a67587578feeb3b074055949a1a83e8/bumuxa.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7e00877c1e2a2deb5197bffe5fb11f64/jugifofonokukolemalulupa.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/jidojomavufitumimogativ.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdacab81b3---dudibupujawodevadi.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/25204267783.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/s76cqjra19q46294pkjtsd4i62/78754190591.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gezes.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/475d032790925c24aea8d1f9572e1cca/sowamimel.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/8603222821.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160752340d5255---niveleguniva.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b83c4aa7---89091116658.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/ludofolegu.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/worupizemojovusaz.pdfIn PDF document text
    • http://allasclub.com/campannas/file/39884235081.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/98858150199.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608749401094f---vosetetagujujefu.pdfIn PDF document text
    • https://cmoretv.com/userfiles/82776142271.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/84969734991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pid+controller+theory+design+and+tuning+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_off00019ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CE3 11116 bytes
SHA-256: 344c981c02e9cdbad5baf18433e858607eca81df23d5a8604f9a0986d1941145
font_01_sfnt_off0001b68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B68E 20116 bytes
SHA-256: b90356d15c89a9dbc0af78e26f5defaa680791dc7c00c8d1628ede1465f9a531
font_02_sfnt_off0001ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1