Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2300df4b2acf1b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 08:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8926e68e4b633bbebb5de6ec688fb1ac SHA-1: 4bbada387701e9841b9ef85c2c1eccae71785881 SHA-256: bf2300df4b2acf1b264a9496fc789520d00f074a9a26aa5f67a3032ceb5dfa9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external websites, some of which are hosted on compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=android+non+root PDF link annotation
    • http://peter-crooks.com/userfiles/file/nizotitotezede.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/97261088680.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a89336e66---64712161839.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/nulofisejorodi.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a93ed54ca---84110343272.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/barix.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/81527005855.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xozirajiweburuxisovusolo.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109130929458286.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/sivaporenopekozesita.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/45229643404.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/nusivegajibaje.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/xuvikunevaxadanezokuxijo.pdfIn PDF document text
    • https://inks.bg/userfiles/file/monexojilage.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/senituviwozegim.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/95059107333.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130495e8511d---58704454283.pdfIn PDF document text
    • http://klhl.com/userfiles/file/22898550922.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/jigufamafazitafawuziti.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/9982711276.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/63737692828.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/debikujewipeximibanorir.pdfIn PDF document text
    • https://cubic.is/userfiles/file/51864783524.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/36198192303.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_off0000c748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 17656 bytes
SHA-256: 5b42902a8a49bec35449af3aa7f2247206b1cea92f7b8ed19e72f4a7a7fe8a0e
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 9712 bytes
SHA-256: 2982c90417446bd69dfba5a33b2eb4f46f794510e9142e389bb1f2ba55ae6eed