Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22d265315926a8a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 03:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e4a222eb7835fa2097a5a318e22d75d SHA-1: 8a076e6bdd95838728ac8da64f24055f47001056 SHA-256: f22d265315926a8a649c48df1326fb03d0dc6380b68de606aaf26f1392e92c93
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of a link farm pointing to compromised CMS uploads and disposable hosting suggests an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://opuspointpartners.com/ckfinder/userfiles/files/38362582877.pdf In PDF document text
    • http://llux.vn/uploads/files/85817387442.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90eebb79b2---6308501401.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ad5b6b5a50a8b482af1677e595ecb23b/85711361582.pdfIn PDF document text
    • https://eniedu.com/data/file/20210829190054.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/35353923359.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/78d92db4dffd10ba13336e050fd4a5a2/lijusiranifeboxol.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/94291132672.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9c2bc616b0151c45b9c915c1054116d9/xatizukoralomuxoketej.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/75370654563.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105080849.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9529b5d09---vibisutazipewew.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8dcce792---wutufudusolibiragarilaba.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/togogotibujijomon.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/4002992539.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/031be8479c577e817a4ff1a152758b2a/zozuxosebekutakobabam.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f238a4dcc2a8c3c4f481845417f88077/zeduduwopa.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91f0e9d21---soneb.pdfIn PDF document text
    • http://one9five.com/userfiles/files/29310873923.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/51442283042.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa69d8e592---53770799380.pdfIn PDF document text
    • http://poiskvod.ru/images/file/kefenofodepu.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/80239585770.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5jmodqlig3o6eaomkf8ir0qm0j/nejinukafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ecologia+de+florestas+tropicais+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_off0000c852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC852 17800 bytes
SHA-256: c3ee325895dba0fa8480ae10eda89f8706e155bff98466ff96d01289335fca7d
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 10676 bytes
SHA-256: e2644fe0013b3c9eba5435d64879da769deaedbda521f670891100ce457b1653

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