Malicious PDF — malware analysis report

Static analysis result for SHA-256 156c08f6c8119cc8…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 23:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 730e6dd6e3dc5e711ba35958517c53e7 SHA-1: 8ac9fb4d9c32ab043f5ccb35298017de86394c65 SHA-256: 156c08f6c8119cc8e37ad424ea3e3419432b5b9092a8c19930fb88c168fe1303
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, suggesting a link farm designed to redirect users to potentially compromised or malicious sites. The PDF structure and the presence of multiple links to disposable hosting and compromised CMS uploads further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=horizontal+axis+and+vertical+axis+wind+turbine PDF link annotation
    • http://phutungototuanphat.com/img-tvdl/files/luwasumujulonogog.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/noxapozejupoxe.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/20494630427.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/pufinumisubegososesukade.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4a5eb950d4e3c1aff605518280c8bd7d/xidugodivasira.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pujulosifoxomesex.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6dfab7c7c---koxezifoxa.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/tobijonezabulaxovuta.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/74707675256.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/26115617516.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16130de5163aab---80424132701.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f4c72523---wuzomakodalokusase.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/26380322744.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/kabitojorigug.pdfIn PDF document text
    • http://sissonne.hu/editor_up/nimosotaxituxot.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/lusofugaxalav.pdfIn PDF document text
    • http://esteel.my/userfiles/file/79502327336.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/18290326503.pdfIn PDF document text
    • https://isleo.com/i_photos/file/34711050533.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/72197107911.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ot916r90vktg6khptmoquh7go7/gevoruk.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48b27b6b3---53713945082.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_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 10908 bytes
SHA-256: a30b9872e16f8638064e558ee323e61566ee3c9632c02ae6046aa01b441dca1b
font_01_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 19628 bytes
SHA-256: 2a150d3e6112ff041b59b1001bdd2a2f57571850d1f0496aa9d41f3aeac15a34
font_02_sfnt_off000139cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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