Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28df29ca82329bd…

MALICIOUS

PDF

68.5 KB Created: 2021-09-05 16:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e5458baf26a19f5bf8483a5d1d7cb35 SHA-1: 58aa9b4e5c23e2a15067dcbb9afb5ca15d594cbb SHA-256: b28df29ca82329bdb7ed93b51fc8e7dcffa0f60741aa72a284604feb5d52d80b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used to distribute malicious content or phish for information. The presence of these links suggests the document's primary purpose is to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://advance-pack.com/editor_upload/file/fezudinofezafakilawaf.pdf In PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/341f66da68d2c99f6de519d333a6096a/kizuxosananegumi.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/46874803822.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/xomezozasobuvovus.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/57496248529.pdfIn PDF document text
    • https://goodline.by/userfiles/file/7311787356.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/08/files/210827221811.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19ceeec07f---renagelusijupeloguwe.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/kexebax.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/detip.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/pejawidizevawigegadudew.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5280d6dd9da2f39fbe51d77849f47799/4982476109.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/maxikuv.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210816195841530117dx032u.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/61264278244.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/gezup.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4213896260.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5cb384b56193e766197056a3f53420d3/tegidoramojogogurafof.pdfIn PDF document text
    • http://yoron.net/up/files/18066490982.pdfIn PDF document text
    • https://masihpt1.com/contents/files/mozaxi.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/kajudukusujofiserevuze.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb7474134---14704424997.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/33939858354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=oncologia+quirurgica+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_off0000af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 14980 bytes
SHA-256: a3ca89513387b04a5f53c7719b2ebe1564e30ebf086f1862a4eb8fb9e9a7f180
font_01_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 10668 bytes
SHA-256: 9841626478833b660274d47f59e4d0c0a348a5e39f37527800b6b91c8f21ada4