Malicious PDF — malware analysis report

Static analysis result for SHA-256 a391c50763c5448f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 08:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 667fa42b3bac1dd86d3f9078d7ac6922 SHA-1: 8d6c2d6408ed808bb77f592c65a6d3e7861cf990 SHA-256: a391c50763c5448fed731ab96c1f8c63ad1dd7017e0039af324c6b55fd4fc279
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, suggesting a link farm designed to trick users into downloading files. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and external links indicate a potential for JavaScript execution or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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=gangster+san+andreas+apk+download PDF link annotation
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161321a5e97074---sakisewovatoxe.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/kuzodumivirenufomasit.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/79891196789.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/zumovoraneverob.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/sasatot.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/vefofajerisawug.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/fijetawexozifub.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/31387597095.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/6026211832.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/moliribivo.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/95822093880.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/30299985205.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/95843194430.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/xirexejowuvuw.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/12751a5b1554cd0a37e4ff963cd2f917/91306748508.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/nuzaxobenedopon.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79e7919d2---3617806035.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/vovawagiseridenamorutoro.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/pamalosazimepafeb.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/65891656082.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/vopawutoradoboli.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/94808264378.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/93052949627.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/ketotixik.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/xogidibomoponizo.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/97720763486.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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 17800 bytes
SHA-256: 64b6fcd8e8398506674ce4a0fb71758a27f2083347a8b81ce6035d1da9737ff8
font_01_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 10692 bytes
SHA-256: 78144d8ce9beee00191cdfc49620af8f11e9f15e6725a9f4385ff21dc9820fcf