Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a84b3e22a7a106…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 08:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9392fe45d9845fbfe1e63c56629f527 SHA-1: f07a0e2c7c7bc12d9250cbf34e1180488aca6dd2 SHA-256: d1a84b3e22a7a10606eaa6876f9768e84a8098030785cb54c20d0b89977b788a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c0d56bc5---vobawaxupolenutosexo.pdf In PDF document text
    • http://thankschicken.com/uploads/files/25828726899.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfc01eee6f---14235202514.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/tozip.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/pisubuzixagabikelupoxekiw.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdcc24b03f---kupevunijuzo.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/nidadewejuj.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/99023998866.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/rifofuwejifulaxenipapo.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/36823887653.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/xojujabemirivizosaru.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/miluraxafo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ms205c995o9bhv763f2c6g912t/49188591305.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/60113382228.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f84119c4---75428925034.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5neb1hqakhulmgj9gtfp372h1v/11688992395.pdfIn PDF document text
    • http://dogable.de/userfiles/file/25664731824.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/fojaduvagijiti.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc948144f4---67169899059.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8165a4271---lupexewewiguribawafo.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/bupupafafuvepomeva.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/ketavopaguzovokifugidojom.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/muxiga.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/gusonaneto.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/lewaxegivinabe.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///24871192534.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/41766838555.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f408311d21---35641516540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=vacuolar+hepatopathy+in+dogsPDF 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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 17332 bytes
SHA-256: c6cc634a3d62b4b6ec02ced1e9e54102ceebfdd52c4221c16762c265d21a2034
font_01_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 10976 bytes
SHA-256: 195ed9a94dfe0ade06ac27976733db376f95d922c2c82fa9a0bc623e7b90dfab
font_02_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1