Malicious PDF — malware analysis report

Static analysis result for SHA-256 885336dabca02600…

MALICIOUS

PDF

106.8 KB Created: 2021-07-13 00:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2906382437bcf9c99c39361b688cb8a8 SHA-1: 8c5c72e533aebaad751ff08842ed98bdeb660156 SHA-256: 885336dabca026005cb3fd7ab6acd934388a33b9e78723401fd5c3020cd5accd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://irlanc.ru/uplcv?utm_term=the+number+of+polynomials+having+zeros+2+and+1+is PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9e4bf3c73---15847524754.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/54962502327.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f019a938---pudup.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d272017c599---78212261316.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/moxov.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d142ca4b1---kimebivapivizute.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/silijuweseza.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ed85ab2a97---23927032853.pdfIn PDF document text
    • http://szwygs.com/upload/murilejulezubodipowura.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/glblio7rp8e05fbke4b3d0r856/32360751799.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/82044654540.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd11b7ed7f---72497982267.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9de69cggk1gg4b2l04vs43ffkc/kuzerozaguweluwogij.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/45855831101.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8c818e2af3bd007d758b8c4d74fbb682/jegadufazo.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/28877527714.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/90454563405.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/sefezepapulabezabukoki.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o395cu943htb1j8si3jrubk0kj/640236760.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5116943f2---21199748411.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac726a6ce1b.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/kazaj.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mavujin.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/19124805388.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/xoveropita.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2mbdeaqujqk6mvn326iptrsalg/27614799637.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_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 18756 bytes
SHA-256: dd6e0a6b83a37b715993e3adce4f602b8bc0bc75d36bbfaebc734148cec99671
font_01_sfnt_off000168d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000180e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E8 11464 bytes
SHA-256: 2cc8ff297450efc1ebdf7febe4fa964c84e7e8c953cb1dafd723fe6692450bb6

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