Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbe6703ceda4c9a…

MALICIOUS

PDF

99.8 KB Created: 2021-09-03 02:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1602f387670b6d8f8aaed5c98875b137 SHA-1: 752910495e447307b7c47f9c875023e144fbba06 SHA-256: 4fbe6703ceda4c9ab7c252cd4ad233abd0cd8ff05c2a29e2439847c6558cf10f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. The document contains a link farm pointing to compromised WordPress sites, likely serving as a lure to download further malicious content. The presence of multiple external URIs and the 'Recovery secret / private key request' heuristic suggest a social engineering attempt to harvest sensitive information or deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c72c2b9e9a8a87d10bd305ca54e43a65/bivapar.pdf In PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/bofomodudetarirozilida.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/pedazowav.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/85863322408.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/so8hvfr2phqt3ikn1hkev4ipgn/nunaposesemudazugi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0a9025fe187bac7a1b2d739b9aef8f1f/mabodiwoda.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c3murf40q2f5uemq04csunfv64/supodovunuvejiputawikebud.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/76926854204.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05a2290ef---zefonizobixovus.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c6e04d0c44bd45381cf2fd8effb4ca50/11427433008.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/85408200786.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/kufefexomamawiluduwuk.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/3913279947.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/kopotepufemine.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f281ba2081---75880121476.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/12887356036.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/57010540783.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/1eub0tlk3cj9u59i9vvrj878bp/13207172286.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3nmj43a4n99mh0s8t6cdcjbkv4/pubabebozaxusipov.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/23920377694.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/22179381565.pdfIn PDF document text
    • http://sartor.ru/upload/files/46661021266.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c5a7cbe208e7ef5373eeb5764d35ac70/dawodax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pwc+blockchain+energy+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_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 18920 bytes
SHA-256: f605361117a3211aca81e786659d16bdf3dd10eb17d4edd51d2927b60d675949
font_01_sfnt_off0001504c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16863 11068 bytes
SHA-256: 0df2252573ea711b534e7691a402c490ee70214e8bea9b386dd45da835d39941

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