Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01f5db34631eb9b…

MALICIOUS

PDF

85.1 KB Created: 2021-06-10 20:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 64b8cbba8dee64f5b63aa17a02403372 SHA-1: 72ae5d96998e4ac4b98d76bcdee7ba1265bd2cb1 SHA-256: e01f5db34631eb9ba9a515caa4dd36dd1f9d7770c49abfd35ac2cfd2b333337f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains numerous links to compromised websites, many of which are hosted on WordPress installations. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a 'download' button lure suggests the document is designed to trick users into downloading a secondary payload, likely an application, from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=fnaf+2+apk+download+android PDF link annotation
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/3b983b8700dce34a2917f3622cff34af/vimikutuxivudurit.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/23fd8f08c943166e201ebe77a5903d94/dogode.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a94cd8a340d---risosogunowotufib.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc7d19da32---xuwefowuro.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/rajako.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3bf8a382---39418053601.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/pejugodetoluduxesin.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae80bfce3---xezawekawelawedufadomeli.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608525a6c273f---sunogub.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/solijogagutorufakig.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fg9p43rm3lb8fd42i54ikviqgi/29126506674.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/44475592aadd3ee697ad926ab4374e59/72385312076.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210519113352.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d45f463c7---34204389495.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7176192e7e---libalopevavepakozugovut.pdfIn PDF document text
    • https://12tiga.com/contents//files/42498435051.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d40da5939d48418f0cad25b4face23c0/51027408272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 4688 bytes
SHA-256: 8a2c94a934951a0b8950743ba6b930c48aab07772cc05f2236884903008fa803
font_01_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 12756 bytes
SHA-256: d4d840f43853de509f0c3059ca4e1f44d3a1067d633bd8aa11e1fc10ed95beb0
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 16264 bytes
SHA-256: 06b6d92114adeda75af3f96122d26ce5b75c0c67043a3966fe4e60826377f072
font_03_sfnt_off00013927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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