Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b525e05906d72c2…

MALICIOUS

PDF

89.3 KB Created: 2021-09-24 09:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 97a6e2f2b3b9088e16e92247affe3023 SHA-1: a9e8298469197b8a0d73b538ef08e63c60bd5a1a SHA-256: 8b525e05906d72c2c214a7e8ce7f7d74b0b6baaf2599f02d11f7120208ad3f33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The presence of a link farm pointing to compromised WordPress uploads and disposable hosting, combined with the 'Password-protected archive handoff' heuristic, suggests a tactic to conceal malicious payloads. While no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=what+ebook+format+does+android+use PDF link annotation
    • http://megatex-plast.ru/pub/file/60360748219.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/82462751265.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/16913899707.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/pigizezewakolob.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xigulagutixutotorefowak.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/burop.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/69164300472.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/linimedumibizarumozibatu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/49293109055.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/vavupiwolenuzegibep.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tiwatenidoleza.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/77349541541.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631235632.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/lilopepemopipemis.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/fatexatixanewuteti.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/724eca0340f8266491405880ea80d235/kuzakopajagoxubir.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/548f17818934f50c8b9f6ad571b4c15e/25038994324.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/25335673167.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021092011272958.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/40219624385.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef8829db9---44510864672.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/mapikusewoxasazipisi.pdfIn PDF document text
    • https://dm288.com/slicice/file/6694309648.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/10423032466.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7869cf675---16704658704.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c19da2371b---89766171782.pdfIn PDF document text
    • 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_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 17444 bytes
SHA-256: 4a8dc53d1a1653a6de6f887fa1ff363ca2271dc0d0b650cdc59bd55cc84c5c6f
font_01_sfnt_off000125fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E15 10900 bytes
SHA-256: 1dcf99e54029982b599f7f4cb0086440b0100722f716140adc2c12c0bd937c25

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