Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7396405cde81b3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 01:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4448793c4d12f300dc95c1ac7cd7a2e5 SHA-1: b7d10f8ef181057ef3a29b7104a6715f83286691 SHA-256: 3b7396405cde81b3b2bf8b43d4f133fdf60d7ecff22b14421a6bffbaaa2d6b69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bartonsteel.com/tony/barton/ckfinder/userfiles/files/55897153820.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614299430855c---gufumatokujukunuwe.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/difigawolelukinemifeni.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/lusazoxufodujabozegudaxan.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/nibizitebufokugofe.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kalutenuxosodew.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/pefukejuletewute.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/detabulopunupiv.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/wetawa.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/wabapuxomaxozavos.pdfIn PDF document text
    • http://abpaluso.com/upload/file/52193193895.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145da3cb123d---37020807616.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/62380537776.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/megovasorijigo.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/13824878596.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/220d85910486c7327a6bf3a8817217ce/torobagavijetamosuv.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/vejujunaxipunenodidut.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/34482828921.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631613366.pdfIn PDF document text
    • http://livestocktool.com/d/files/kodul.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161334ad477712---xafesafazusare.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/93383288640.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/patewari.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/biwevodazuwudufiw.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/64465520689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=happymod+hacker+app+downloadPDF 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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 17784 bytes
SHA-256: b8386bf07dcfe8761c731629aae50f5dd304bde26e5be1e6e4542157111b3cef
font_02_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 10704 bytes
SHA-256: a4f2de10b18e0d1f9f0e1e985de2fd00596248cabf7871ed61fdf8e4f4ac48e4

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