Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8d25d6e0699f77…

MALICIOUS

PDF

78.8 KB Created: 2021-07-16 11:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6332964a35f89c6ab6de0e1d816cddd9 SHA-1: 567da1af406fa219c576e8eb4367f91b8b0b2bb6 SHA-256: 1f8d25d6e0699f77286ab18e69ade56f50b5fa3687072aff5ba32e8560ba7ef3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The presence of multiple external URIs and a link farm heuristic suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ludifrance.fr/userfiles/file/nuxufazegixav.pdf In PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/09bd1c7d0655fbb100dde60e127dba71/tawafen.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/47b2ac4d68eaa515dc9cb7875f333253/rokupuwunogisuxa.pdfIn PDF document text
    • https://actor-conseil.com/files/file/vabilibekemani.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/moveripotofudopomegotiwez.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/48249931868.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080124cec9fc---55949394405.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd18603685---fofiwojisizomevabok.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/joramokef.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///94560311544.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/lajelegukakepalaravamawo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/83b1o4r5jiitj2d6p0vf2o3mga/21350897333.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a6713495---lanubejatobemuxoxoju.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/28242616477.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/bewalefolovirizajowijita.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075437beb953---binujumef.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160be563c9baea---riwube.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/sopiwos.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a18a1bebf---73057065307.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/numegudujig.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/88350562868.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b296fb2f022---86929765357.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/65829309963.pdfIn PDF document text
    • https://hcviet.com/img-phuctri/files/75305595861.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/nvn9ja336e4d5hroi4al0vmg72/pigawusopujenivan.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb78d4001---fopezavizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wef+the+global+competitiveness+reportPDF 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_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 11128 bytes
SHA-256: 231d58e94605a01b64402ab3e181946e9882019d831532d559f685aaf04b6ab4
font_01_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 16496 bytes
SHA-256: 97962066ccbebc69fb8035c8df7fd61294064b6fe93e7b0e7103622ba38d2733
font_02_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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