Malicious PDF — malware analysis report

Static analysis result for SHA-256 9147970ce50673a4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 10:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4249a481d8c6fd0e352bb060e88c6cfe SHA-1: 76f23d183c77f85eb403c4dab7491bb35a628375 SHA-256: 9147970ce50673a4ffcb1030976d860dac68e89a300a6929afa08d2ee3618800
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external links strongly suggest it's used as a lure, likely for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://thucphamtruongthanh.com/img/files/relog.pdf In PDF document text
    • https://isigakizima.net/img/tmp/file/sozixowaxezuvuvososu.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/15119876674.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7516ff823bb5c951d2452c426e054b2c/70843324503.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/zixapifunu.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/68261261768.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/32c98abdcae37add31ac1af428ee0822/tukuzezuloneji.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/95396734624.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/16682723622.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/14f3d3051a4d0a80167948bfb972d52a/sabuvap.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/59188238616.pdfIn PDF document text
    • https://khanikango.in/file/59833679781.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/jufomimikalutez.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/vinex.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219182254289661.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/zevorudexedozos.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/58909092886.pdfIn PDF document text
    • http://18554080.com/userfiles/file/tuwunuripaf.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c11a49dbe---10835806683.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210924_26EA674C9EE06BA2.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/8923908315.pdfIn PDF document text
    • https://il-gusto.com/images/file/vaxewidupafijujisaxadod.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/27aontalqmt2utnl1c7ee5gh26/93307703510.pdfIn PDF document text
    • https://bachson.net/upload/file/bukidetase.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1942311547613a4a4a4084f.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/xurela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=good+witch+season+6+episode+4+watch+online+freePDF 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_off0000b014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 14872 bytes
SHA-256: 1a8e54537fe905befc9ac3c5cb73b8a5d19e7abf9f0daa85d6076bc810b63dcc
font_01_sfnt_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 11088 bytes
SHA-256: 25b7c4811409af0b4e44710be9f601d872705a1108d429c28c62f83143d0ec3b

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