Malicious PDF — malware analysis report

Static analysis result for SHA-256 888d28e886827f9f…

MALICIOUS

PDF

82.3 KB Created: 2021-08-25 03:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff35f2b50c39b2158a9fb8c14a1e1bc2 SHA-1: 3f10934034a8dfbdcf4d35c39d99e882d8b93f3e SHA-256: 888d28e886827f9f3598b4c78b36d023398db09ff6002c2f2ac04534a4148b82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, directing users to various compromised websites and disposable hosting domains. The presence of external URIs and the 'SE_INVOICE_LURE' heuristic suggest a phishing attempt to trick users into clicking malicious links, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pixomot.ru/uplcv?utm_term=size+of+arraylist+in+java PDF link annotation
    • https://charterfori.ir/basefile/charterforiir/files/27057239592.pdfIn PDF document text
    • http://darec.sk/files/files/tizalab.pdfIn PDF document text
    • http://abnicum.com/files/file/vewepamaboxofufoxukorixe.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/02e24d5fa641eb86191c6da7f936d1a4/24216408325.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/21548646584.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/ritikona.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a64499d243c59c1b19aa909e5b98346a/motativ.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fapuvelokuxalojekeko.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3dbe1b034cd9e355acf6d1c995615b58/28936411439.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/tolameforilasoriwud.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/dafufogolexulot.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/bf7d1a985591d7c7a57992dde8481a45/74744376826.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/39832049550.pdfIn PDF document text
    • http://446888.top/userfiles/file/puwijibewogeb.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161042dda56a3a---51693856754.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/579bf44ca41d12fa296ad55921cd1c01/69691582258.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16123ea2e7af05---nejinezuwujasetevo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/31962775881.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c842613c73---karotumadotunarafurenutu.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/66956955075.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/486f6d397d0c72eb54aed2cf5f9972cb/mamuvotaketove.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/pexorabavifot.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_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 10652 bytes
SHA-256: 14e3fad0a5746f10205d297222f229020aef97ed07374ad9b4c90c5feba34846
font_02_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 17796 bytes
SHA-256: d55201e1349c7674d85e08a47324ddb929998fa01ba2c1a6e8b3e604d97f224c

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