Malicious PDF — malware analysis report

Static analysis result for SHA-256 b330a68d0588401d…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 10:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 1fb08ffa798aa575de2f648b1afdc651 SHA-1: b762512deddb68d6af17f848b8157441ea705abd SHA-256: b330a68d0588401db92930ab2bed0712f1e81b184f1bc8f6573899bbf3a4ede0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure and embedded URLs align with techniques used to distribute malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/bb156ed6b89230b45f636491573653f9/10733659296.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8f34149175af74eb24f3559880fcab18/nunigul.pdfIn PDF document text
    • http://cortabellanews.com/userimages/3043713052.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4afa8ce443c16e18dd6156937eed3ac9/vorugow.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/jisulomojusewuwusogeruj.pdfIn PDF document text
    • http://getem.plfiles/file/87531255982.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d763ba5ec---sisiboza.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700c3a28fe6---regusasikotejesi.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/10061608634.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/lhrj264dpjlfqsqspt4to0q2o5/47449866155.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/tosuvuxurezafudetanokal.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/81131765795.pdfIn PDF document text
    • http://inistor.com/ufiles/files/26935754838.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/65693722648.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00b44a794---84972778596.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ad7a6b462ccf140954635aba94411357/pimizilor.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/42417335221.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0fbc0b14---9566106510.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/740482170.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e390f1fab15a4eb447085e9c1c262177/87070758639.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609674bdef02b---ruzuxudilatarojobamuda.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/617s8vi2a7cnuf7lgtp3nf8mlv/4965919102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=should+a+single+member+llc+be+member+managed+or+manager+managedPDF 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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 18644 bytes
SHA-256: ddee6e83efa041f66604f7e37337f968549d7d8545c4117c8ce897b27ae8cfee
font_02_sfnt_off00013172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13172 11036 bytes
SHA-256: c44b1365a103af2c943d8d9731590be2a800564f5223d88e41859158f3738ca5

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