Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e780bcae94088b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 21:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70feb9c8f6231c6b9651a6578743880d SHA-1: a3f9a75932a0afe889412a94f5fbc8cfa237eb13 SHA-256: 88e780bcae94088bd7851276a4b15ba55c90ad8cdf9e0b4b1ddc92b68fbe1ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118f23f81ade---robapen.pdf In PDF document text
    • http://inwallendorf.de/userfiles/file/zezafefap.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/95766670059.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9491e4ee---dunajuvulojuxuxej.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/39347703800.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3d540b1fa7087908c5553b3b5944eac0/52657851266.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/fuzef.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/89593024626.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/vojalivez.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/b2ec3v60u6ru9naosm7urrc8on/26693966509.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8bc81fd4638711e27d3fb4fc25859ae2/fuwozegalutazofeg.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/gimulugigubikakaxo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6360c3f1---19796386441.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9084ff08493625c56b0cc3f7479bfcf0/kumopezajiwagesojemonejam.pdfIn PDF document text
    • https://isleo.com/i_photos/file/rolibumo.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/labazazu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e486177d21c12204a0d925efd52a05f5/lonadatubemakenamexota.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9badafe4d3b621032644fe31516bd513/rulovelixitosudobiwapu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe7ba93b6---rijokesosulenixazumilapi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94239344d8---torezabupinub.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1acef8b6ed83bae678aa66fb7780e32d/bokalazoponugegur.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6fc90161e90202a8e750882dd20c77bd/wabonor.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/9782440516.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pisidikodaxutebej.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/41178763516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cape+chemistry+unit+1+past+papers+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_off0000c155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC155 11016 bytes
SHA-256: 7da869ec65de7efa32ba0274525dc134cf985273748501519feeb826cb2ed486
font_01_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 17440 bytes
SHA-256: 84d6c575947139b9c0d4a3b80805636b4083521926e4174dcf106f40300f90a3
font_02_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1