Malicious PDF — malware analysis report

Static analysis result for SHA-256 a595c282e2498b7c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 09:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96754d015f862cb380cd2b6add96d4ac SHA-1: 0c63d2d8ed6ca9c8fcb5ee9e57ddae67068b2f0b SHA-256: a595c282e2498b7c51a5697c28887c1a2fbb0de88a91d6ac81f9a6dbcbd474a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links pointing to compromised websites, including WordPress upload directories, suggesting an attempt to host or distribute further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=fifty+shades+grey+123movies PDF link annotation
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16139810ae5197---7424502037.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/20331222067.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/64529814501.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/43191702891.pdfIn PDF document text
    • https://fivetc.net/uploads/files/rojafuxakarenisi.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/sizowukogusabiseduva.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/nubigofovigokexufujitovi.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/sofexupesofezuwe.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/74638513251.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/94377491580.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/godikikirapozibenutapatu.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/puzakivejon.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/xipavejusezalujoku.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xudavumuxezizeloz.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/6890417291.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/natomufex.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161383ae93958b---vapimuvokiseka.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210902_996D620A82DE7AA7.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/disovu.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/lofuxudagak.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1ulv90hbgoc8dtc4s82pvd4046/67869178588.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/21391875930.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_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 11152 bytes
SHA-256: ca625dd478c980fde44a1dbd989615619f93f02f0f22c794e4481612ac857d1c
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 19052 bytes
SHA-256: 9c5acb21bb715eb67395315a2c942fc44cb5631b3078991172278e1fb7c30c25
font_02_sfnt_off00013486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1