Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9c95e2f4609219…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 12:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bf03d498137f6c55761ad932d334703 SHA-1: aec1092f630b3d14a32971734bad2235142d061e SHA-256: 5d9c95e2f4609219fbb5a69f3c1e52560a880e2bb641efc7b3abfdc2c9b85c49
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://whygzy.com/Media/Uploads/files/12495501000.pdf In PDF document text
    • http://stefanourso.com/public/userfiles/file/33617759914.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/33668474952.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/kuvolofefenanope.pdfPDF link annotation
    • http://cec-intl.ru/app/webroot/files/file/51188231521.pdfIn PDF document text
    • http://dominant.name/userfiles/file/fodixotisexuxinid.pdfIn PDF document text
    • http://waypl.pl/upload/File/19083136858.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xizejejikiwodup.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/kufiwixitat.pdfIn PDF document text
    • http://www.heksan.com.pl/file/xunatoba.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4af2084d2ca574c9c27f2b239860b623/84196341663.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/88c01eaf36a1aa80605a397edc448962/7249231772.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/78a2ee2fe2ff61266e94a40575be6da0/lifufavamekose.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/besamunivedag.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/3091594424.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614237ffcefdb---11820441102.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/serekafaw.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/48535364079.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/tofopubowen.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cdf7ae97b76e15fbfa0861cd3fe838b4/16535926903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=create+web+browser+in+androidPDF 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_off0000aaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF9 16340 bytes
SHA-256: a83050daeb18bbff2f28509da50e93b66c333b82652ab6c0b005456bdb59fe20
font_01_sfnt_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 10452 bytes
SHA-256: 5f2ff390392f586395bbaf13301547705bdb9c4826844e87eb9efe732ec7097c
font_02_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1