Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccc5e647b85ee76…

MALICIOUS

PDF

68.8 KB Created: 2021-09-21 16:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a61cc1fab945a822a12c4cc31a69e9ee SHA-1: 26e772547f508f756335100bf260dc97d36c2314 SHA-256: cccc5e647b85ee763b7e1463f1f80a17398c942eea1030e985f5a1044d528c08
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://angkortaxiservice.com/userfiles/file/begejopijuwi.pdf In PDF document text
    • http://global-leasing-management.com/uf/file/lisojimexagokesu.pdfIn PDF document text
    • http://fitviewer.info/files/file/32828746052.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/loferuboxokujavalu.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/19496610356.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/nopifuwokojupej.pdfIn PDF document text
    • http://konberdbio.com/upload/files/48602168486.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/83147293672.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/60891207825.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/12761220067.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/48235631448.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c93f8d8ca---rebiwuvijisedufan.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fdf3fd74091f4a29156ef3ccf28fb2a6/95906408370.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/xigegokoku.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/mexitoseg.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b2625e016b6144b6b73c84139357aa3c/rejokazoxibiguxafanozol.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/kuwunawezutase.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/47635146261.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f903c45b4c---tijoxunexu.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/sujefewelofomixudulur.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/jizopobutevigadatodij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gimme+more+roblox+idPDF 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_off0000aeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFF 15572 bytes
SHA-256: f01fb884568e20085d74221afce3f26d51f10f0684b79f3e919b942448598477
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 10160 bytes
SHA-256: c6ba3e448d45a96bb83afc73e6eb559db59152ab46f4c6d125a53b09ac5e3d07
font_02_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1