Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed42d7281d37106…

MALICIOUS

PDF

87.8 KB Created: 2021-07-04 23:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 6285f23bbfdff27739f7c25da04a7bb3 SHA-1: 56a5e8c384b98a4ad4f6b1680535061a51ff67a5 SHA-256: fed42d7281d3710668a70b312150b8b62276fc71c2f9dbf05bbab53df9389144
136 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 a ClickFix paste-and-run 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 0.9952

Heuristics 6

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://crysiq.ru/uplcv?utm_term=how+to+connect+cpu+to+laptop+using+hdmi PDF link annotation
    • http://epicridesnepal.com/files/rarududekeruv.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2736b20aef---45934677748.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5e828b10200a530ae0e08b00f468733d/97815472817.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee4f336c0---7027050277.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/wulegarefanokuviforuj.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd363b52646---kekasewipejiw.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/66f32b2bd91a87e86cc8875cecfcf86e/65580952029.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607932bbb40a6---pafumebuxexej.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504060534518253775.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607903a148d52---weberijevunomixegukar.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/gubuvenobejutosuzunodanod.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a17d2f84---40676968810.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536e007035---7202653869.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/96266241414.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/2767550936.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/39724357340.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6100246757---93096134853.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9ebb493b---gumojemepipoj.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/bivanopezogo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d84d417fb---32043413517.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/24058644632.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/11862244064.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/39819132581.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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 18148 bytes
SHA-256: 13414ba1198faefecb500e913d4c467297102c5489f328bc7d4d6544fae90d36
font_01_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 11036 bytes
SHA-256: 3f67a5c8c3a14fd5288094df80a950928c27fd682f1b391d3e4a7b6dcf004ba8
font_02_sfnt_off000137f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.