Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd63cb88ccad2168…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 18:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3057be4ceb516951eec742eec9124fad SHA-1: 14bd31c27bd2764e85785fdfcab05a35a311e596 SHA-256: cd63cb88ccad216838f9b535a2bf5d190a561b330fc5a897e5f2177451011add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=clash+of+clans+hack+mod+apk+unlimited+gems PDF link annotation
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/vofifupokifonugimi.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/digojoravapofebe.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/faxuruzukibonudet.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xeborovekopotovisabage.pdfIn PDF document text
    • https://wineart.online/userfiles/file/zenatemuvamodimewogapajen.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/21665685839.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/18506604361.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/17240805159.pdfIn PDF document text
    • http://vodnik48.ru/content/file/nuxotiw.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130becd61c33---34447859709.pdfIn PDF document text
    • https://el-tall.pl/pics/file/zidoli.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7262090a---kaman.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/degokurerupo.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/69814899647.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/linenogogeju.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/xilume.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470add9b85d---31105964277.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/daxigikud.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/novefelolikukotavorateji.pdfIn PDF document text
    • http://zerosquareonline.com/file/27417463879.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/88338086067.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/tizoxapowapasipadapeter.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_off0000b284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB284 16636 bytes
SHA-256: fee8a04c6609a2ef60b9edfc35891a5a72fdd04d0b5869706f9629f441865a96
font_01_sfnt_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 11192 bytes
SHA-256: badaacc88c6500d65fae462f249a4c4adaffd61d903357475ce72b2e67f18537