Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe35abd56d64ec0…

MALICIOUS

PDF

79.2 KB Created: 2021-07-02 05:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9dbd78dd97ac37e344d30a1d44e6c5c SHA-1: b0cb449b4f5ec28cff297bd4762722f8689ad52c SHA-256: ebe35abd56d64ec064846311ea0ede958b12eb96e2ccc0aa3f4b040625949a7c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crysiq.ru/uplcv?utm_term=pdf+to+ms+excel+converter+free+download+full+version PDF link annotation
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/14275302971.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/mugaxejevesanumovebit.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/flumo4c9taegsskt0fflodt5r1/jazizuvunokefozowixozovux.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/niwesudagan.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/39827000040.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2ba7e14bc3112590e9009ffc29a7a566/wudutuwafuwujuxekodavira.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a85d75d7cf9fe207ce7bc12e42d33ae0/53910054791.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/wegezuvizediretapukuvam.pdfIn PDF document text
    • https://aspirans.com/files/file/92616392118.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/31443063535.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/a5ce40b536845be03f615b4695c8cdd8/rubatosawuvakube.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54cbc33db---nalizuganozigelaxemo.pdfIn PDF document text
    • http://allycatering.com/userfiles/22105366502.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af5883fa7---82901550556.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa27ef5bdb0---resapenufedowoburugup.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/633757cfbb558dd61ff24c15cf3a5084/luweg.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/99222289191.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/04930b94aa7ef81945b42a32569d6c05/sufoden.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/17163332175.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210604_2D4E475FAE3D8494.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/35170472781.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7sh67ecb1cvdekfp36s2c18rt6/89979814645.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083b21f37cea---76138116704.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/dinuwajekugibupusowafe.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gbjdlegrve1gm8av04lpgva84r/kejodesugobapukizadut.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/jewumabuterilirul.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/49328fa4252dbca1d80ee8123687695f/sefinoguti.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_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 10992 bytes
SHA-256: d9873aec2054efa33153a69d1fc914517697c417992b252061b2dab6fb9e62af
font_02_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 16908 bytes
SHA-256: fd3249b526f85c243192d297e98d7fab8e8820e2986036748de5ae8b8ab30d08