Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d32717506bc99c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 19:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd6c1756a289a07684aec96d97e9b2f8 SHA-1: 580749996078c63924b2117db88f1c8bd5fec1c6 SHA-256: e6d32717506bc99ce20f7ad38644611e3aacba51384389018d7c34a1fdca4474
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be leveraging these links for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://rlmlaw.com/images/edit_images/file/11137319747.pdf In PDF document text
    • https://bodymason.com/user_uploads/files/6364057099.pdfIn PDF document text
    • https://diphong.com/uploads/roginalumowilavewu.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/86642219.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/t0k3vgi8gu69ckdpo9hltd37ev/liwozakoritipologes.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/79568865151.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/74334702510.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/pizula.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/97636543520.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b13c68ff---toferofeku.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bab8a0ef6---15145407176.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/fajaniritatejefa.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/powuruxabovo.pdfIn PDF document text
    • http://tcihk.com/userfiles/vupim.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/6378360216.pdfIn PDF document text
    • http://skomi.ru/img/files/file/zisidofujatuzowek.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134386f38ad4---94387178692.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/23081018063.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/71410416301.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/85742742468.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/lumiwod.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/24495760998.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/39754848349.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/54035636102.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/lixodekoraraze.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/56530040071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+application+development+all+in+one+for+dummies+barry+burdPDF 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_off0000b1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 11180 bytes
SHA-256: 938d886add6081ed8aa3ac96f8a6d98f41a596e4f499d5d32aaf7896816bf39a
font_02_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 15244 bytes
SHA-256: ccd88be9d101fc2a6ab7ab5d2e32761bdc5b3977f2ef626a40749dabd4f0d9cd

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