Malicious PDF — malware analysis report

Static analysis result for SHA-256 685182aead644405…

MALICIOUS

PDF

77.6 KB Created: 2021-10-22 10:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 913bb00574e47e20d7c70c01c5619c31 SHA-1: 06de271ec914d317ac2d6233331c0ebde1b1a056 SHA-256: 685182aead644405cba7276f150f1f8fcfd459692b767021217d2be955766666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.barbazan-debat.fr/ckfinder/userfiles/files/rubukobepezelawikuwaluvo.pdf In PDF document text
    • http://ttworld.hu/uploads/content_files/files/dedogutesujoretazexodixa.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20211021115240.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/31985749035.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/sifixumanoxite.pdfIn PDF document text
    • https://extractos.assaludips.com/Proyectos_PHP/gestor/images/file/gulisobamibepon.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/972a8858f48b6924bf4f158b81d00268/78503579649.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/82488042426.pdfIn PDF document text
    • http://setunari.com/uploads/news/2021/10/02/file/80637835228.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/73924603960.pdfIn PDF document text
    • http://tauben-buchmeier.de/ablage/userfiles/files/matobirupasunikujurakisax.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8c9e8edfef6fa4b25ad28f2b7e02492b/mutef.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/kabaritu.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/ledux.pdfIn PDF document text
    • http://taigesw.com/upload/files/12725632123.pdfIn PDF document text
    • https://tuinvandecruys.be/file/76356509461.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/8152678119.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5bf76dac0d74cf96a9662c94118d0bfb/52374489071.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/64691998285.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/mixifusasoj.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/felibifekikorofewe.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc47dae447---tidukixogepovuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=mouth+ulcer+bad+breathPDF 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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 10336 bytes
SHA-256: fe5e1b40be591f9b3d24e53f20637316703f6afac47010f76eb27e8d9079239c
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 15656 bytes
SHA-256: 92ba01c78c51bc88f4a9930e84c658c253c6608f5a22798216c42464625d9cfe
font_02_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1