Malicious PDF — malware analysis report

Static analysis result for SHA-256 724faac0953f87c2…

MALICIOUS

PDF

77.0 KB Created: 2021-10-02 12:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d98e3dc0d6e23668ffdc8c82dd06de0e SHA-1: 59071e12ee01ef2f90d02aeed1960868f0a8f993 SHA-256: 724faac0953f87c258579e179c690478a298fa3cebc258904834550487103a3b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ketchas.ru/uplcv?utm_term=chinese+dialogue+conversation PDF link annotation
    • http://mansiya.com/uploadfile/files/sonaxekojopesuxuveravavo.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/80167614533.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/zawolezulafirupu.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/gutokegogexuref.pdfIn PDF document text
    • http://cke.hk/userfiles/vikepo.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/fokawomiluzulukosixefapuz.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/zisubigiguvoxi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/v5s463kagjpmiqiri7r5v9flq0/kuzetogutinudajanagubabum.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/98522295308.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/80594944261.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/keridibuwogefa.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/vunirire.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161482fef96a49---mulikil.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/79984493968.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/jajemize.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/maluzumemolag.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/werovejuvefar.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/774c97da99d7b25cc54ce61a614c7dba/butonajusebajakuf.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/62525273091.pdfIn PDF document text
    • https://gangnampools.com/contents/files/muzanexopitusalo.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/segosulekuwalajeneguxave.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/36852297082.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_off0000bace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 22532 bytes
SHA-256: 4c4d047f5a6017b4a90aa21664c163b9e9a95007756806810cd9e4a2f5e9e685
font_02_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 10848 bytes
SHA-256: 44cf31082b7faeb80976b0d90d303d0fe6699d74ecd6c985219568c3ef17a58d