Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c871527f502e8c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 06:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fc44c862b1591d5a9cfe8bf2b9e5a81 SHA-1: 2a5cb9a6740bc5ed5c1562de2bae23462304aae8 SHA-256: 95c871527f502e8c667439d54ede1c32d97d25ed6ef95a1141feab13960fd613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ceiling.holcom.vn/webroot/img/files/75574397224.pdf In PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/wodobixet.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/58860403812.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/66987222430.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/xuwagetewitibuvom.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/abg5el3pjofumfk0qgfn6scho1/99611908074.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/nawolerutafof.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/42675520520.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/vefesuxekibari.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/20365608494.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/lazemufaxenuz.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/65586090405.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631819432.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903210806.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/kupilawo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a5b354de---roniwi.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/99277491197.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139461a96601---zokexosexatuziri.pdfIn PDF document text
    • https://linardi.ru/files/file/92205968105.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/mijijavevogomafimegu.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/69548234725.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/46368622552.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/87359689387.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/6483372157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gta+3+helicopter+passwordPDF 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_off0000c413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC413 10804 bytes
SHA-256: df880a599f40ce394ac2ce7798a6fa06c0482cf0398d3367a18ac7ae607dd0a3
font_01_sfnt_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 16944 bytes
SHA-256: 7ff4997402facb193c19bac11194041e7937b5750ec7bc6714d182e912354947