Malicious PDF — malware analysis report

Static analysis result for SHA-256 147f9aa726ea5f44…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 08:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 256884fbaced8a5c651457df4df369dd SHA-1: 18ffdc31eda8262cb59af9530760a0ef496eb892 SHA-256: 147f9aa726ea5f44dc196cbbdecadc968e24b783bd77f9a6da5baa88f7f99dd3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit vulnerabilities or deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.dkmodels.net/ckfinder/userfiles/files/sebize.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/99080539496.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/72631610864.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/25c55af655f2ebb83a4bcd78bedd70ea/rigexagajogutimok.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/90266814525.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/p4diknbfeumhabbc91q869is15/ranixuzesotu.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/58341328377.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/fipudipigogivirivaxidodog.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/72615507226.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/89732800181.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/gidawafo.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/66574101829.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/98876682638.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109181205121970.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/24585815830.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/91627420016.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161431418c9563---27879533997.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/28263086837.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/61978565082.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/76742940953.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/bodudirufaxumunoxo.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/xamorurom.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/daladobepowutavixotasal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+4.4+2+kitkat+apk+downloadPDF 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_off0000baac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAC 10508 bytes
SHA-256: 3fdea596ed369b21fb572022c594b4446052e75e3492264dedbbb3ab0d7dc36f
font_01_sfnt_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 16644 bytes
SHA-256: 7dd6e434172bdaa83ce63ef12253f79836d6a0d7ccd7f7f4466cf8ec61661395
font_02_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1