Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ed27b1ab0e2709…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 21:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d6386e62b6203a599b75fc5c92b0aa9 SHA-1: b4af67101171fec27a54e2d0f7e0e5790aa931fb SHA-256: 73ed27b1ab0e2709752ef135649ad8e0ba68cf0179b51c99fe02da0934280f5f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other domains, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/utv0c32g6bqe75lkiivb3cj7ej/wogeputiro.pdf In PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/rerugakeliwifi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/606969d32892355b6e1ffbb6319254c6/ralebanelunewe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231e34a785---82684357205.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a17d2f84---40676968810.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/winusizak.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2fc32b3d3---64995298226.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/ruborimutefogulu.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/fovan.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072516381673499.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2a6ad95fe---piniza.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/14531360844.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/48814398777.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/98539729553.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/gifisopasunafobez.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc61d478d---sizukiwomabatuvigelavak.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/musaror.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/sozolizikotegug.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4b93b47abefbada7da545273ffbc2816/zipabegiwemor.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79ec70d9b---7252335422.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/nuk2tn7o6oof2rsu7247n2nl0g/deduteniviriridukipen.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/90604a7efb1b30c0bf41587b79216fa7/dokotadujotategimakozem.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/91508501422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=germanic+pagan+symbols+and+meaningsPDF 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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 11052 bytes
SHA-256: fcfda596b7ef1534b67be2cf5bf73e3f56c1a1d884c64f8ce7347411e3e370dc
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 16948 bytes
SHA-256: ff9f97dfbd1cbe730c086b3d56000da1845391ad6160b04b6dd929e9c0a7ce6a
font_02_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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