Malicious PDF — malware analysis report

Static analysis result for SHA-256 27233d68b09e596e…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 08:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62a81031165eb0d039a2a2b0a5c7609b SHA-1: cb113eeced39044b95f3239b092c3b0b2bf7982c SHA-256: 27233d68b09e596e02841b4054f9144b3fbf91399b90497b02c79c7afe4a7f74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d66cfce932d---lexine.pdf In PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/xelizajabavapa.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210824081615.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/30953541669.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afeb546afe---fuxemipavamakuf.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/84272784746.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/98114752689.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899b4fc3221---61890523329.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/7fddfdd4a9f60eb4f1e377e4fed4108d/lekolaxanim.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/35576328670.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160802179a7535---nanavovonatubutob.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/88c476618e6adeeb83d9cd712402f144/kavidukigo.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/xalinurokepavurov.pdfIn PDF document text
    • http://planbmedia.hu/files/ketonuboxedikakafewelu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043064af82c---gavilerejekod.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/59139954289.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/karupopijonofaf.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///bebixova.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/he341jcmpqa5ehq73lt62age2f/korudawesumugibovezu.pdfIn PDF document text
    • https://razredna-nastava.net/files/pozezi.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/moxisaginobaz.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/49310007232.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/92101533001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=estimation+of+hardness+by+edta+method+pdfPDF 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_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 10956 bytes
SHA-256: cef84b75cab159ce280c0d2c05dd14a460e08c20e86eaf4b194e51a9c93c2648
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CA 18888 bytes
SHA-256: d2cde3a20a015d0b6fe28ea5dae5cc7b61d1d3ba6a5f7d22c0273ec00a268499

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