Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eadc3e439bd7a0…

MALICIOUS

PDF

87.7 KB Created: 2021-06-24 15:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fd539ab73e3068cad9a7fe7eefb9f685 SHA-1: ff2011a6cd8c7f28e06cf111afa5bb331efd30f4 SHA-256: d1eadc3e439bd7a099858d01f4f15525d6f6e33c620e698b0d46eb56a5548d26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The embedded text 'Editar pdf en linea gratis' (Edit PDF online for free) further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f8ef5845c487e9e18be45da4953775f7/52700895752.pdf In PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/pikufojuguwu.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210620012049.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073abe9d188e---16904728369.pdfIn PDF document text
    • http://lg-palette.com/upload/files/kiladodikotifon.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/nagilotowavivoda.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ndpt2u0sdbdogntc73db518lro/poloweragu.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/32245421025.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210508173001_1035959471.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/jeniwad.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bc35fde9e72---mibirexibofozexapawel.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/fubibewafujomozogonuto.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1111899a1---duluwerubune.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/48858283712.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090abde2d6cb---dusigobuzegowizimulaserof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=editar+pdf+en+linea+gratisPDF 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://scripts.sil.org/OFLIn 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_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 5168 bytes
SHA-256: 3c1735d1bbbc9c3cef113ea2cecfc379003557133611eb59ab801845dabaea26
font_01_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 12056 bytes
SHA-256: a8b106ec1c30007b0cf5730ab95ae869dc2b47d22d37e7a025ad17d34e9c34fd
font_02_sfnt_off00013a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8C 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e