Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b75dbf105ad6653…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 17:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bbc2ee3188b2d43d989f9aa07a36776 SHA-1: 29eb23160ef9fc2d22d9ba01fde8e0b75771451e SHA-256: 2b75dbf105ad665327bc1af241f6c2b87bc352a2142e4e88613ecab38be0e4a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=kenwood+slow+cooker+manual PDF link annotation
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/57207193084.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mimilapelefosobapafogofis.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/92994544175.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/rogiriramigajiwoje.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/41202396946.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/62918813963.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f4b10710---lonijuwavubiduru.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/89566646960.pdfIn PDF document text
    • http://wsm.hk/images/files/72748798251.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/47607595616.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630815024.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/38215525505.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/mizobutoxetumibusomos.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109040346307411.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/88735284071.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/72496538129.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/95495475832.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/47012584569.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/jivumudorozejoxulebalu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9f6d5571da93f896508c5ba2b64f564c/46066396120.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/fenug.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ialhqud1qvui5hjv9e83net0o0/12438336375.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece829b80a---rosutujoburulibofatosa.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/10897537016.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_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 10612 bytes
SHA-256: 4294e805f6cc75a3bd9a40808c250c995432226fb089698569cd6303ee2d8fcb
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 18352 bytes
SHA-256: 8e313a0cb61cb2637b8a7b88ac3e941b3f5b93781ba9210a3be8260e2884c49a
font_02_sfnt_off00012b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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