Malicious PDF — malware analysis report

Static analysis result for SHA-256 53137e6d8ef98d66…

MALICIOUS

PDF

82.2 KB Created: 2021-08-25 07:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d5b4183863100eb9307739a9a02c0eb SHA-1: fadd8e9e01bd4eacaad39c16ccb25ccfea78e993 SHA-256: 53137e6d8ef98d66b840f32b174683f5599ade9f55bf397552d494a295b1084f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload directories. The presence of a visual download button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The embedded JavaScript likely facilitates the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=how+to+make+a+pdf+hyperlink PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f9ab887b27b8734e0640aeef2a240c97/meridowubasuzel.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1dcb9ffe8ec56c3f1d7176261775bdfc/71021437961.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/13004893958.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7f4fe4e3c4e8a08a69a55cb4d6b270c4/bagikemowenazivapu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f8a6eeb5c1d192ed9d9f7a4ab7f9b6c7/fijasajilituwobebe.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cbbd36e0b---23650933982.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///totabit.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160758c066382a---buropesedixalupixiva.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bed1fa8561---golokozelifakitugejol.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1cde06a0de3479c4f97434b0c1ceee6d/44808277546.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac226c1731f---23340881700.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/gevavoreragitisuriviko.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/32574471172.pdfIn PDF document text
    • http://simoncaulkin.com/images/36354028714.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/nesazikinemew.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/tasenesujuwox.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/927e9abfd2679d1eb16878f58df4c021/vobokuwiseb.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/32887092106.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/98188538072.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736778a6e36---bimibesefuk.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pd6crb94rktlon09t087q14nvh/jubifovivaditotoj.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/suzuxugafivikudilatuj.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202167121529521.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/87111c5238baa2dbf2d7210712ecb01a/94667949662.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/fiwewepoputixomilosa.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_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 10876 bytes
SHA-256: 7f3e025a59e9197b92b7bc192c91a73933d86a72ad791e25f95b9bdffa3e0a27
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 16568 bytes
SHA-256: 36156be47f53d2c257ff1b3e03edf5b8c6b9c2d7e5cf550272ce15b88371275c
font_02_sfnt_off00012176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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