Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a845b7caa146654…

MALICIOUS

PDF

82.2 KB Created: 2021-10-13 15:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 10f2fa860a8835504c6c65f98b597640 SHA-1: 1048e4ecbaad9354ce4598bb38511792128089f5 SHA-256: 2a845b7caa146654561c128a8ad25b6d724e19339e9f46be0e937df5482e0913
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious payloads or redirect users to phishing 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://chcial.ru/uplcv?utm_term=fahrenheit+451+censorship+quotes+with+page+numbers PDF link annotation
    • http://denkobarbell.com/_upload/files/92814437918.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/koxogarusebawarenogeno.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/10818907068.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161619c7fc4ec2---tiwago.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/wonure.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/lusezinubimesakop.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/tusabex.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/47160770345.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/nizof.pdfIn PDF document text
    • https://somogyplusz.hu/files/bubisa.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210918135946.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/15995719026.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/2964822862.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/43600470158.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/pokawonub.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/13171695546.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/tevutu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b43d0709f---xoxipajitakidugezezipe.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361628b812b---nafizakaxamo.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/zaguwujoz.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/47268897984.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/50809214170.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/96030830643.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/82901170059.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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 11488 bytes
SHA-256: 802ecf7fc2514e59ac0837ac461f58a2992feb8944cd29885e265c9cba515cba
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 18292 bytes
SHA-256: a90dabd8c5a9e7215c2db72b02d7d760bb2bebcca1fc41c9f77d1874b8b5d0a0

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