Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44feab970da78af…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 06:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f84e39ab8ed379113841bd8f3d5105e6 SHA-1: 71e43c5c5f6df53815ea5ef099d4640f5f75e801 SHA-256: e44feab970da78af07e3f7563db8c912dd9a532adcf5ced5c7c740054c785952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, aligning with T1566.001 (Spearphishing Attachment) as a likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=example+for+sorption PDF link annotation
    • https://istanajp.com/contents//files/jikopozafuz.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e245d3661f---vozexut.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6c743942---junofijumugafajadavev.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/26956428066.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8bb34083---41920691681.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/nipogabaxud.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/mufulajun.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/83064644760.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/xowibe.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c889165986---dejemoxomadok.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732889b5fde---gijakawitakagomu.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/midiboxa.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/3070387330.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7ba82c342b091577d6cbdec69d41196b/20754878909.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/630e025c4a57a09ceca8c5f936481025/vusometu.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021081414555673499.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/81250580150.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d14449d12---tiwasurokuzulibejujiti.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e14173084bee0acca209b4bdbb2684a4/nonokutixad.pdfIn PDF document text
    • https://riwg.in/userfiles/file/24224076916.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/22027074389.pdfIn PDF document text
    • http://tano-cable.com/d/files/gigad.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/8868851994.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/def7525248f908ff33d15cc624d728dc/62719332611.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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 18252 bytes
SHA-256: 2d974c87b04d7157281f25f76308dfef62390fa7ec7a134e3cb80e1576ee3709
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 10604 bytes
SHA-256: d93afa3fcff9310a4a06d4454a524987310f622353882a530be3d3bfc062d0cf

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