Malicious PDF — malware analysis report

Static analysis result for SHA-256 f497ec65e68b6b13…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 03:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 224d68eb76b23e4dfc064d8fc51b5205 SHA-1: d0591d28f67dc3d77def7a3562a62f43e84b3aab SHA-256: f497ec65e68b6b1312f564e59d9d47b5061da52e636fbef8de32ce6fc2cddf13
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to potentially compromised or disposable hosting sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://shbaicun.com/userfiles/file/2021091216074273499.pdf In PDF document text
    • https://rajakeempat.com/contents/files/jisozevibagam.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/56922747524.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/mazonuzugerudasi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcd5099e3---20930933164.pdfIn PDF document text
    • https://dyaa.club/uploads/file/jonetupeza.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/kusupemalonitedov.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/jumimil.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/kupexaxuzakikanawojobipab.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/bopux.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/67365463330.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/95836623163.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/mudebepibuvudixikopujik.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd80dd2c7---60049537466.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/pomize.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/wanowodufuwogivulewagosag.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/15007665139.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/matotofopav.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/xuzefonu.pdfIn PDF document text
    • https://ms2oke.com/contents/files/lakofeze.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210914120253.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db42292b1f---97445116052.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/40880963775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nes+1200+games+apkPDF 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_off0000ceae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 19388 bytes
SHA-256: 32c2691d6d3fed7c74dda1ce77ee9305dceec46faae086407be5a7dc64b614b9
font_01_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 10396 bytes
SHA-256: eaea700a04c254d192d1f835e311e465917adb2c7a8aa7ae5e58584d6bd76718
font_02_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1