Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda7e54613f50bed…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 06:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b08bb31fc33e39868cdd19cff809684a SHA-1: b05ca276de1d64aaf42655e71e1f9fa7e9d5ab81 SHA-256: cda7e54613f50bed49120aef2ea7600f71a473fd7703d017c7e101a38bdae229
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The file's structure and the presence of multiple external links indicate a link farm intended to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=kannam+thumbi+poramo+karaoke+mp3+free+download PDF link annotation
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48304b420---8021994509.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/xufiwosexokodefu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/eii8cdc32nr0r0e5ss50hioc4h/82171012794.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/42680447222.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/bizomuw.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/lumepogojejefutozew.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/97382292816.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb1dc09d---92208257605.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16142893d8434b---feziluvepuvuviratatex.pdfIn PDF document text
    • https://plasy.com/uploads/file/wasutavimuju.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/xulifonajopefo.pdfIn PDF document text
    • https://ms01bet.com/contents/files/kivuveraxupex.pdfIn PDF document text
    • http://zuszdounky.cz/files/razedun.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/filuremefowumusirofebire.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/lukujipezoda.pdfIn PDF document text
    • http://iscelenie.info/files/file/fosuzidululonojufix.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/kogesiz.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc966b934---54764865431.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/befugumawuruwino.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/zebemoxidonawepexenu.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/natumetumefamalemolin.pdfIn PDF document text
    • http://guowangcable.com/d/files/37260838445.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/67756870549.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210907090428.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/rovedotivegupeze.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/nikiguj.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_off0000c00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00E 17692 bytes
SHA-256: c7a2ad9fbf240329feafe9810a6389e7a9bbd7bf2241e774c31f8dbfaf246caf
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 11176 bytes
SHA-256: 2e76fd1850a98864692f7f6beea15eb1e2ec2dda936b37ddfa6ed31355179691
font_02_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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