Malicious PDF — malware analysis report

Static analysis result for SHA-256 832f579ace18924d…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 22:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f697e97b7f455f9868552bde6f4def70 SHA-1: e77e5145e11c3de7b5cf608ef14bb0b086d41d1f SHA-256: 832f579ace18924dc4a439744dc6e5799a3b7dcfd446f5d3e38fa9b2dd0ba648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF's primary purpose is to facilitate initial access via spearphishing, leading victims to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fa2742bbf8e35d3e36a54bfaac729870/limiv.pdf In PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/zofebove.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/kenemogozud.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/pubimadudukujabujedonev.pdfIn PDF document text
    • http://effekt-film.de/files/file/93762914595.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/zojagosawaximerivapobaweb.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5dba5c3bd03072b909ad834bdbcd8557/jofofatokukotuzobaka.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5f1e4a89b3e0f7faf52dccf26b8e0b6b/badipofagin.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ecad0b99---281578221.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/zuwijomejulobovaforet.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c06a250f---25557681807.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea8d6cb1e7---16971778230.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/idaft1dcl8obr0sv7s8017unh5/porazanetap.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/bepil.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/08f11a5d7f58413b716a9fec51477d2f/18921566096.pdfIn PDF document text
    • https://palet-school.com/files/files/vubetanabuxawa.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dca621e7a4---24675058277.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/supapo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac086bda33f---wuwejixupodixozufesef.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/warawaxugoribuzunu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/36878790123.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/89484432349.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/mirok.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/gutizimideved.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/56004485352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=iguales+pero+diferentes+cuento+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_off0000c539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC539 10848 bytes
SHA-256: 90a4228340badcee7c83c7031c402e59f1b49207374d284912e583b4638d62ae
font_01_sfnt_off0000de2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 18320 bytes
SHA-256: b52ae3f81098b0eac348958152608a3eafffe5fb893e6cbd593475956f6f0751
font_02_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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