Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47f3493ba22e1d1…

MALICIOUS

PDF

96.6 KB Created: 2021-09-12 08:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d797b1184bfde6288432594eb1c8188 SHA-1: d21db9810d3817ba443957cd7a8370225047e24e SHA-256: b47f3493ba22e1d148d4df0f52c32801b879e1413534b93aa930a5cbc586dd21
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 compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://veaodaibrahma.com/uploads/image/files/40256518054.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/68ccab0c55eff0ff0e882325e3032fe7/89638208770.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gekexosuzipaje.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/dovifasofazi.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/poluzubatodorukaz.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/burokomudawulox.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613367d57e55e---52320552160.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/lovabofazi.pdfIn PDF document text
    • http://shesob.com/file/files/58172201661.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/majixedenorulijopemat.pdfIn PDF document text
    • https://businesslife.com/content/files/giziwegizototolin.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/mumazepazopobajotazujaw.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3f0e6037e972309803f8653bde2ce996/75824145352.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/zawogirugovifukapig.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091006252373499.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/62097575363.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vibepagilurajada.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/89862231411.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/68491272390.pdfIn PDF document text
    • http://cocoal.com/uploads/file/95137768447.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/sovomujokuluzimefalinoko.pdfIn PDF document text
    • http://benetalent.com/upload/files/73221175458.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/padofegivafitipavufebogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=les+choristes+film+complet+en+fran%C3%A7ais+avec+sous+titresPDF 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_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 23060 bytes
SHA-256: 58263aefacfd8c396f8ba07cc85c4472fd349bd529c06823cff800b1e859e2be
font_02_sfnt_off00015859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15859 11068 bytes
SHA-256: 54c3c569b16c901c466680606d47e0f0740491975cb948b489209914280a1bfa

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