Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5e4c7e95f91b49…

MALICIOUS

PDF

88.8 KB Created: 2021-09-08 03:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 689de56445151bc0866d5ea92fe2ae02 SHA-1: b426d67cbc54917d1ae2e45778d16385f5762f14 SHA-256: ae5e4c7e95f91b49cfc72920289f9e9c6a2034edfa5749a8b38ada095111a6f0
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating an attempt to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier clean score 0.0803

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dichvuhieuchuan.com/upload/files/fexidukenifumetutekasudo.pdf In PDF document text
    • http://klassn.com/ckfinder/userfiles/files/2782458600.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/xepuvemudamebuteralujemup.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/desegugevefitazakizogu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c53149dcdd9c4eb3b440240a70bd9e9e/95787008056.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161320573435f6---40811467094.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d0142fbe4ff7850b92850ac516fc2260/tijexidizolokas.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2126514a4---87497428782.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/84834894958.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/73488779017.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c7435894---90838250698.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82ad24902---sasebebazewepos.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/22494267773.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0ca986552b7298b86c88e51c5f5111c1/91925906347.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/66523363743.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610abaf9eabb9---27197470620.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/19e0d883177eae6154e2f6d9dd8a05f2/werekurik.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7af346158---70040799904.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/74008193201.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/nnrs3nt68me0okg8kt9f8lstg0/76570840874.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dixujutavanolonoz.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/17717918584.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/mexubasewoxalikaja.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d19a0b8978d---8906434175.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/jopalopola.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/29647276047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=anabatic+and+katabatic+winds+pdfPDF link annotation
    • 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_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 10512 bytes
SHA-256: 064c595536837e787fc2cdc969472ebac7c120262cbc0092f5a38e0228238811
font_01_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE0 18888 bytes
SHA-256: 9b41862bd9c489fce385b94327129e60391c921de40fc3820b5e1762c25981b5

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