Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd98c527a0bf2fd1…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 13:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f67a1f3e3f47060b17bc9a6b5d85a5d1 SHA-1: 6703aaf12233f508239eaee9e94b7b92aa7dd70f SHA-256: fd98c527a0bf2fd165b8c70ccf1747298e929bb644688b9e627b6c32289f19e5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mentor-tutor.com/newGroserLikeProject/uploads/files/vuvitejafasiwebogibuxawam.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9aa872cc---gakojuluturaxajusor.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tofaxifoxe.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/lexaku.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109191618383929.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/969649ed852cf947a5e04e0df3baf77e/6836671803.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109051934205192.pdfIn PDF document text
    • http://yilip.net/userData/board/file/24133435447.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/83891587221.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144f6081da70---gapuxibasujebozalug.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/bitariku.pdfIn PDF document text
    • https://maviet.vn/upload/files/fofizumubifurokotepida.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/vikoputusoj.pdfIn PDF document text
    • http://maxbrio.kr/files/files/fanujubuwa.pdfIn PDF document text
    • https://hirurgija.me/files/85797709128.pdfIn PDF document text
    • https://kimcert.org/E/file/56426244127.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/67028804977.pdfIn PDF document text
    • http://winso.tw/userfiles/file/89561630117.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f211f29838---buvibumokowaremise.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/tadikumike.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/wokizaxuvevorop.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f3ea40440b6069ef8e2da838585b41ec/18105857574.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb18770221---5751769954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=digital+clock+apps+androidPDF 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_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 10652 bytes
SHA-256: 36936f0a93f65c0695b4d8ae2a2c64582b69393fdd204d1f1ac6c44cfaf3fd18
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 17392 bytes
SHA-256: 952b932c073ad9effa91d6220f07ead5cceae0938f49a2a28dadf099211c56ec

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