Malicious PDF — malware analysis report

Static analysis result for SHA-256 295a716c25b9cc40…

MALICIOUS

PDF

92.1 KB Created: 2021-06-30 03:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e0bb8d1e9344fe0ab13758cdae54dc4e SHA-1: 6632bc5e61e7d41267262f1351d144d0b37a4961 SHA-256: 295a716c25b9cc4016c82d39d54b14b05df509ae2bdcf756aa1c4e6f07ce25c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hydrem.ru/images/file/levokageberojugebatoku.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9c59ee9fc22eea9c5a95086113e06454/kujezavaxib.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/615662683ad1b3dfbbfa0e84591c2483/6716536689.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33e9328d9---pibopabujupufawivexizuwo.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/64185971901.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e0547ea8---safixej.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/15382730891.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/gatikijupobuwebideneje.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210602224947721.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f2f72281---woxuxudevinukab.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab376e37aca---83627968551.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/29083739699.pdfIn PDF document text
    • https://coevent.ru/upload/files/zamutuwulogimijena.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/93159ecd6eaab102371c60325c9cdca0/dudijep.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2e146159ea301de747121b295ead1151/xewejegotexovegaja.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94b6ba5c2---pukatewuvigevujux.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93477387d---6506806689.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089871b54d83---33996479511.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f727cba16---58877328707.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/9578836545.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160728d9567eaf---fafaxedan.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1475cafd8a0fdf53eacffce9bfc1c16e/12986038516.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c770fb3eadb---sekulotalatefitunoxaxuguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=an+indefinite+period+of+timePDF 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_off00010965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 16488 bytes
SHA-256: 17a76fc1ae7833077dc981f27ff1c3d0a22cafb34d70f658d749d78526da16b2
font_01_sfnt_off00013425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13425 10264 bytes
SHA-256: 1fb49ddc9fdb4718741f5f893b8cb090c499dda237b58ffeb05ce3e9447c1318
font_02_sfnt_off00014b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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