Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11d16305ea23b09…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 11:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a7511f37ce3f78e83e34546015f157ca SHA-1: fc48e77226b65b927ad52e891a56109de5287692 SHA-256: a11d16305ea23b098458dc9dbe408a1232f90a4b8aca7908aa110d0c951c56d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The file's structure and the presence of these links suggest it is designed to redirect users to malicious destinations, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=beyond+belief+fact+or+fiction PDF link annotation
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/335de435fe199cfed8525320a40c5c53/kevorunave.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-02-18-25-44-48.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9cc8e2d0dd6646e5c43995fe4ffccf64/zisok.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/66933786434.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c365a1463e---99210480617.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2a321a0df61f294f851e0fb12a9e234f/15042372438.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/30fc96380b5ad629fed7ebe05840373b/49920927327.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e6a4991864dd62eb027538111ff340ef/vawitalozovowefi.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/mimifuvot.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ef6240f3b3ef07469a89a9499be526a6/walepivaruv.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/47776611578.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/90293803970.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/4673604569.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a0147fcef---39419145931.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/13711081873.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021626137144694.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb225c4711---94329305905.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcf45bfbd---66085093709.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/78667417809.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/firomogobagifulinitor.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/39519581380.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/41685058877.pdfIn PDF document text
    • http://jp-cable.com/d/files/texufikosi.pdfIn PDF document text
    • 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_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10608 bytes
SHA-256: 502be4a3140efdecc8301d7c6b6bbd387d856c19538f31117cbf1b74f6168ffa
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 17892 bytes
SHA-256: 67a8fcfedf9c9b4b067b67e8e3d74697b1420fc9a236a772ab45df4272412236
font_02_sfnt_off0001343d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1