Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fbbe012b41735b…

MALICIOUS

PDF

101.6 KB Created: 2021-08-10 13:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9049f6b2f1a1e1818e06d5cd367f08f1 SHA-1: 18605068b80764205cd7ec6a3c8f05a42531429e SHA-256: 45fbbe012b41735ba6fe7a292220ec128f7c762b3f678164d78ee2a2b06607d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with spearphishing attachments designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/p14ecgiourq5m97amgubor32vl/96800720241.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e0128158c---burapakogekotasimeni.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/64250327458.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/kowetedepemulijiludok.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc041e98de9---58434492234.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/52357548690c71f34cb15c8cfd75be39/11867722290.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/89227547287.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e5001f207---65022086699.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/22793658463.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/57894541349.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b345c1995---bekapukujofakovosilapuxo.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/20489708419.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/603c008842e96e950cda55bd290eecb2/pajituriwurinaludut.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcecc26b3---zomumorekilozuzirisedefod.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210723_061839.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2806e003d---2280130130.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/44132521213.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/cd59753611dbe443066014c0d1a55851/safenasupilojedem.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/5840582953.pdfIn PDF document text
    • https://tigaintan.com/contents//files/sufuladoxezenixo.pdfIn PDF document text
    • http://airfa.it/userfiles/file/19809089039.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/64965384451.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/51997719096.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2a7f3b06e112e145d06513e8af85a2e6/vaxesovidif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=7+day+carb+cycling+meal+plan+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_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 10784 bytes
SHA-256: dfb881cc43c88c4a1f42b4029089a1e532a7f11a6686f5c1e6d9340617cdb7f4
font_01_sfnt_off0001427d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427D 17560 bytes
SHA-256: f899f059bb3395dfd3254f413b36566226c1711727e5765bd5d403d9be9cf8fe
font_02_sfnt_off00016fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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