Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f20daff3c9c0e61…

MALICIOUS

PDF

98.1 KB Created: 2021-08-04 09:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: afa9835a494066c0a7b9c25628ad2074 SHA-1: 9dd16bf8d12e0c8b5d16a0abe8ab37db74f44cc0 SHA-256: 0f20daff3c9c0e61cfeb33223bd704688da4de04dc536676d8dfc4115243495c
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to leverage compromised infrastructure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/d53b89h6toeohe60vh1mbq8r37/tadej.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610635bc4ddc7---14037587852.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4885e64f169958ad1e8b0543a9efe09d/80125198971.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/87555556029.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb3d2cb71---30809203704.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/fawonadazut.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0896c79f97---gebebupukepezixoragubo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d98c13b984c---74931453161.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/a4quo5m59ii7ohbufhriuv3831/sezifokowitakafupenal.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c90944fcf6188e06790622253243e7eb/kanezomametoruwexejumixaz.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/rifede.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/35790529171.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/94822323386.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160827184660cd---lunogupuzedaxejifu.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e9ba98dae7695e2bf9fdb0781ce32647/21021438140.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f043f8bc4261a6cf9c65037928dac069/80534694528.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/975120505.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/92860603750.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/galoxafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=calabar+high+school+sixth+form+requirementsPDF 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_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 18600 bytes
SHA-256: 24fe16cdff050696a4c0fb341530d2923a81bec4e5bfd02dfffba42686471bcf
font_02_sfnt_off0001606c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606C 11300 bytes
SHA-256: c4f831be523e0f7beb13174c70190c6a919af85b16c422a75d60dc3d4bc381e7

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