Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d694c3b04a06c6e…

MALICIOUS

PDF

112.5 KB Created: 2021-07-01 23:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15979216f164052cb713135caf8451da SHA-1: 67721e35b684ccfed6caa3730badcfad8f41091c SHA-256: 9d694c3b04a06c6ea02f42799fbc02475dffb130b5ee01e3400a194edea2a3a3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://healthmatters.me/userfiles/file/kutotavegimugatemujine.pdf In PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/feadfbe35ef897d5b33d21258b0976e6/reviwusuzugumatodekez.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb73cbb4b0---24483663292.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/didufip.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/95145503082.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637ef8afd3---43061575634.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/dofarowak.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7d1154d76c013bc4f9cc020135e487db/manufi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfa7d8e2a---2634070807.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/71819744338.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/d7aib7vnpg3b66dmmc7ve15ffv/lasulapodameb.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eba37001c---juxexife.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210618115820.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607594c8195b4---gajumanifekifuzemo.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/55823950132.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/38443586087.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f62b8936---gaxafutugiluzepelosam.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5edc8bab2---tuxazu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mugn3lvtt57mk3tk7rbguvf784/napunesiwaxowoponunalipit.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5ec05fb10---90417933208.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/26168121369.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc046b2a54---xozun.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/8811516294.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/65622371700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=recurring+canker+sore+in+the+mouthPDF 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_off00015345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15345 18336 bytes
SHA-256: 0c43e1994262f3384a25586f93a43deb95fd45ecabf4fdeca15a3dc30d994db3
font_01_sfnt_off000183d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D4 10868 bytes
SHA-256: 9e41e1ffe6aad1f9bc707bfa44c290c6e7576a8c45ba9932f06a5f98902709fc
font_02_sfnt_off00019ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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