Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b483e0c876dcc2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 11:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c4eb16b6ce910c29a0bcb1d27f556dd SHA-1: abff44b95fa73384b88f37c14a6b90c77994b799 SHA-256: c9b483e0c876dcc27ad22adf57ff9f32c35ca7f000714c7160c88c89b970cb7c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains flagged as link farms or hosted on disposable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm detections supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bselink.com/userfiles/file/tudexeduxaxegusebulinapuj.pdf In PDF document text
    • http://ipceurope.com/assets/file/36071336341.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8e7d9dc64e7f4db0a877cade4f01d59a/vevimuzugerativojojafe.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/dagugikawe.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa712c264---85628422567.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/17035981616.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/zivupamibipisa.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/58286510157.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/rojoxikatusebekulelugi.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/fozajon.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/melebixorowixolanofimow.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11822208860db6103cb124.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/manijetawabofatin.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f15587cc5be4f43f054782c204e3fd7f/rosuperenigifepaf.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/56848399973.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/xagerefafurakirun.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/jizupisebigotadejonizisa.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/9188480602.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/52503117008.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/62345652156.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/kusomuvilovumuzubadiboni.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612558903efb6---pomore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pl+sql+programming+tutorial+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_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 19456 bytes
SHA-256: 2719576a7ec2a94d74dee492f5b61166a7d6b3203ad0fa21328bc0d81f5177fd
font_01_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 10956 bytes
SHA-256: 2a8e20b2f44f291ddbc9d4dee0287638f23609bf6b655bcd43476a8238477a00