Malicious PDF — malware analysis report

Static analysis result for SHA-256 c458aa3ea441bb02…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 01:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 519e0c12c5ef449bcc967fb3dda535c2 SHA-1: d61f1047fd1ea7f76e178c69f610ddecfd260cf5 SHA-256: c458aa3ea441bb0236564b48990775b525190f4d5ee35a6040aacd22b6c365c0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS links points to a tactic of leveraging external resources for malicious redirection.

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 https://drafthe.ru/uplcv?utm_term=stickman+legacy+of+war+3d+mod+apk PDF link annotation
    • http://sakulchaiplace.com/Uploads/file/39182401579.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145f5a569d48---kisonenikivasabelizewojo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b9b8378fe9e774d2dd7b8e08977d075b/89646347928.pdfIn PDF document text
    • http://wwstationery.com/files/file/jipuvumoposajipu.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/livafabeba.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/10703171133.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/widutem.pdfIn PDF document text
    • http://orthodoxnews.us/file/63908729063.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/gifefidaxakotukosazeli.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613106c034247---pubikorususenanexus.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/fejomiwuj.pdfIn PDF document text
    • http://usateatop.com/_upload/files/wazuvoxukizikaw.pdfIn PDF document text
    • http://darec.sk/files/files/24727450666.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/62141538900.pdfIn PDF document text
    • https://sealskinz.ru/files/file/60024978475.pdfIn PDF document text
    • http://cecev.com/stockages/files/kipimulexopebawozumaj.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/bamezajowobinezokimuda.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5b110e39---67996367084.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/motiwekul.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/viwafejavujowipibuxovu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e3b2e0d016f0c909936295a739e8a4e7/49998158200.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/supukenazowexiso.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/22422233388.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_off0000b396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 11332 bytes
SHA-256: 9df2f6f5610b9cf9e8eb47eb986140cbe353c03663b8876bead227cbbaca9169
font_02_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 16600 bytes
SHA-256: 6f4a788361f2a8f0ce0dfc8a2a04b040b3f2929175121f2d85bdfc99b23f7f12

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