Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa689c749e360a7f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 22:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20d124f0fb64b2ad3fe0a2b4cfe6b262 SHA-1: 5235b26abbc0bf89963667683e2125c8a56dbf9e SHA-256: aa689c749e360a7fc2a02beb37dea6decde66c7d427c597c930b0552b05c3b62
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://vivo-mebel.ru/upload/file/3672848428.pdf In PDF document text
    • https://xn--interpeas-r6a.es/upload/files/tomogonewusawolelinare.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/muzepusepexozesosal.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/83972703129.pdfIn PDF document text
    • https://digireg.se/upload/bewewelonim.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7828aecf1e2e4b9f7ee0c24ed219d912/lelafogavowefasuvulemi.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/54479751320.pdfIn PDF document text
    • http://punaide.com/userfiles/files/60549100402.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a31073f33---junekiduvilu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a97db6ec436---fitigabetemuz.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d38c06c5bf54032d153bc590ef9043d6/74809914048.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/61969060010.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/nibabug.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/wupiwofebifaxinuk.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/46702322794.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960e49add7d---zanexukux.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/bubevefefubemi.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/57530103319.pdfIn PDF document text
    • https://aitalk.vn/upload/files/nekiwisinikeberilo.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/31183582232.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/48102778302.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/79268541843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=swachh+bharat+abhiyan+essay+in+assamese+language+pdfPDF 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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 17768 bytes
SHA-256: 50abfac556009a43f512e5790736e5a0151baf3d24a145ef9c6d1dc20c62c08a
font_01_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 11464 bytes
SHA-256: 291e6a0e02fea4fcf264f9b331bc0adaf0c741a93d777069cd6bca04d5b83035
font_02_sfnt_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1