Malicious PDF — malware analysis report

Static analysis result for SHA-256 8216ab33068d8ece…

MALICIOUS

PDF

86.4 KB Created: 2021-08-23 09:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1cebe00e93892edd1fa87cbf9403f125 SHA-1: 09961ebd464ae1c0b30948e7f9c05a80f07a539a SHA-256: 8216ab33068d8ecea399a490e0d4818a556f4b348a67efea15b4a98451762922
204 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'download button' lure and explicit password instructions for an archive suggests the document is designed to trick the user into downloading and decrypting a malicious payload. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, further support this phishing and payload delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://magerp.org/upload/files/wozefuwubemisonolugi.pdf In PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/80320113068.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b18eb57f77f---24511185237.pdfIn PDF document text
    • http://berbun.com/user_img/file/niwisovatorokokanopenerus.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b79f1519e---17329542823.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/gibomemanapomotukaz.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23089c25f---sexuditajemolaw.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a9ee01b2521cb48b6ad869fdaa0dbc02/87112650106.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/cce35256859db424d9416438e27815da/63035531823.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/27bbceddb6d7360b930bd707f59f258a/novadejizezujujebimov.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d518d7b383---98863745844.pdfIn PDF document text
    • http://derma-dts.de/files/file/68998423668.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/kasulifim.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/96182084716.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d618a2f44---84706279180.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3fb64f183---misuzatokutazexit.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/92096478887.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/049869e5aa5bb4f9ab251b7a90676ff8/42217630542.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/lugisu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/46s8pstp4ma7v8s543hos0gu82/81040784515.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/8227898063.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/73925972382.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/gokuponululorone.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1kf06sjcrd92fd9ndgphkqna21/48461166658.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/65028714920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fonelab+for+android+registration+codePDF 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_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 17212 bytes
SHA-256: 699020e8b4985b7eb91d8b08394ad3b939ac0d23a5ff2a1ffb1dd309dc0bd5c4
font_01_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 10768 bytes
SHA-256: 3d8650501486e2e68344304f417054e1bbfe3fbcc4a44fed2d5148a06739713b
font_02_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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