Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff73fe99bc98902…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 20:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bc0210098e924d63245ca9c853b714a SHA-1: 06787993cf12cb6465da675e7b77967e222ad013 SHA-256: eff73fe99bc9890246817a4c28ef12a7eb28ee20bc975f78865c1e3d003baf3e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6f9452dba45124b407c8b7ba934455c6/pofijebesojulunev.pdf In PDF document text
    • http://jinshi66.com/uploadfiles/files/larama.pdfIn PDF document text
    • http://fygl.net/uploads/file/011920293267.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/18513617357.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/70873360385.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/73776321755.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/55659556705.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/zirer.pdfIn PDF document text
    • http://seritour.com/rsm/files/7029492376.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/65386871907.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337c33d280---xujewilosa.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/3100089200.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/buxedoguwademubusefotoxo.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/tedumipomonos.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/63364378932.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/finamutuviwimodub.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/93601495753.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/fujezimojefuto.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa073c47f4---misovox.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/rusadefaxamozatisosoko.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/gepuxotelowegitukinazi.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/sutalanojapikuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dragon+quest+viii+mod+apkPDF 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_off0000b919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB919 16380 bytes
SHA-256: 826260d7a56effa304a97886c72d0e98e5e5aac0f34e1fdbbf66751bf3dc0d82
font_01_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 11092 bytes
SHA-256: 3298a23a955846a93fff74c9968b971fafb4e4cb5f9ea3cee264723080a3ced3