Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e5e303a3c255f4…

MALICIOUS

PDF

91.3 KB Created: 2021-07-28 05:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 37a2d1604c2fd4f3750d75eb7a598ee0 SHA-1: 1017ea63d6f136028fc69558d2b0d8c9ae17db95 SHA-256: e4e5e303a3c255f40657a42068740f7501e35215e195ff716d7e6327ac01ad04
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/al6pvnr3n96akqtfadqc464t9c/68720433017.pdf In PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/12372155427.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/fa78f0b54a3bb8dac81927b029d3046d/21119444251.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608700b250161---benalunazelisaxuviv.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/igftom3us3tm6om1cff2447a8d/boditeguwuwoj.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/77109077764.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5l45d982qgs1r57v1ekrsa6odr/wezokutugonizesuse.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a584394119d---77244811835.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/39520149498.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062619210973499.pdfIn PDF document text
    • https://esz.jp/img/editor/files/61970574671.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/51852736794.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1b9c34b9---rabezevozefifevunit.pdfIn PDF document text
    • https://wrd13.com/force/file/59761911337.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/86571568264.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f8fa96cc9---92042862829.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/60592787101.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2826c4ed---mimejixa.pdfIn PDF document text
    • https://senhewood.com/d/files/bepotarusawusisegogutiw.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/oj5i5he0qm8mpp5vfsrqo9sokl/fojobejelowixiraxirofax.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/suruvekabomaduv.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/womigiwixikobobedubam.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b2d5adeefc0026f096ca2aef3d73da12/21932145654.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede0457c496---mabavijefawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=%C3%BCretim+takip+program%C4%B1+excelPDF 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_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 19472 bytes
SHA-256: ecd68044c929114819bd5ca8f91c04cd171d40b09eedf3d667d837e03186392f
font_01_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 10788 bytes
SHA-256: 45d9c31dfd40c6ee1b0cc0164e9873103decc9c4bdd5dc8fc7e5b5268f458821
font_02_sfnt_off000144da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1