Malicious PDF — malware analysis report

Static analysis result for SHA-256 be886b1e163b0566…

MALICIOUS

PDF

100.3 KB Created: 2021-08-01 04:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 334a849fa9da5ab06956a1be7d24df79 SHA-1: ad24c727fe8e6df94db0acdc49e1582adb663c1d SHA-256: be886b1e163b05661e39203efb2e56f8915a0df3d8eec752d694c9dff7869943
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://constantemails.com/userfiles/file/162482336112113986457.pdf In PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/nexavawusegobagisora.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5a71115ed7ac5d8f9bcd868d5ac0c3cb/64407212047.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/65110589168.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gdhvhec6lchm7sjaqfk0scdtmp/52896425721.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/depude.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec094577c6---bezejuxipetig.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088216ad13d6---93946410303.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0492ca4e08c524271e966badc83869aa/72124073466.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b5d01183c21843a39cbfa051c1262155/64529728384.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718323b1ef9---44362284967.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8ef7559c---42884285489.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/32789436882.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf4882caa---11283438799.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/26567750037.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/1952199777.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/soguga.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/81967561849.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b898099---76869136583.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7317300bf0f645f62dd7370b10ed3e49/87514456191.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/wobotubozafa.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/komalawofugixujojigobalis.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803b12c3837---givevixig.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace928f3bdd---40797306923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=discovery+education+math+techbook+geometry+answer+keyPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/pirobope.pdfIn 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://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_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 18052 bytes
SHA-256: 4eb195518032d0e6f4e6de34dad1a5805aa198399c1540faca6443f0f18d63e6
font_01_sfnt_off00014f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8C 11372 bytes
SHA-256: c220b2e22376ac8334bbdefab2bc4b291c9119a4412cc63f5c263c02dc1242e2
font_02_sfnt_off00016a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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