Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fce8c6b7c648f8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 00:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e63ff3c39c731f34e24a435b8e247ac1 SHA-1: 1b87ddc977f00bec76ac6981d5ecee970a667d0e SHA-256: 62fce8c6b7c648f860e281a027ed256bcd514c94d5e8cd3ee416857a56f97830
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=best+movie+maker+app+for+android PDF link annotation
    • https://morethancars.eu/uploads/edytor/file/72923129982.pdfIn PDF document text
    • http://18554080.com/userfiles/file/pitov.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614278de997a9---45712628831.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/79358309374.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210912161747009425pp9h8.pdfIn PDF document text
    • http://gespk.com/userfiles/file/nojeterotibabiruwewikuniv.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q862i3lkkt7m44h0iucqf0dn76/2434303920.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/29185467318.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/66318285925.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/87898253024.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/zobulut.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/584d9122f9fe80f7222374c12cf7b643/47821093206.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/37170788170.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/tozajagemibibisedamidiv.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210905011458.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/rezekuz.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/23641722675.pdfIn PDF document text
    • http://viorina-deko.com/images/file/3979253653.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/63095382818.pdfIn PDF document text
    • http://julianina.dk/upload/file/95834673101.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/76711689007.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/3849649230.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/71571800182.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/23663561569.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/12051954377.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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 17624 bytes
SHA-256: ebf07ba1ee0bff430e3763a50f6db92065d96235785b6bef4d6deba38b5ac3a5
font_01_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 10824 bytes
SHA-256: f615e214cb44cb00039833f7f0e92185d7c0baa565a071a8194d0dbd2da21661
font_02_sfnt_off00013636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1