Malicious PDF — malware analysis report

Static analysis result for SHA-256 be973f82992099d1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 22:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 81fa15b23b0d673a5d02d916099c54f4 SHA-1: af33b469d7c0548e58e11f22821279147886f52f SHA-256: be973f82992099d11df677a8fe0e9dd2994d011dc2e2afc78ad35e68b468da2d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The primary function seems to be directing users to these external sites, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dongamold.com/fckeditor/upload_files/file/xukiraxupewukekexigiruti.pdf In PDF document text
    • http://cloverdiamond.com/file/5753037184.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/83816335851.pdfIn PDF document text
    • http://yilip.net/userData/board/file/nalimapepodosuk.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/50982c50860a2a282853abe36a7f3ffd/29188978374.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/57497429132.pdfIn PDF document text
    • https://combrooncom.com/contents//files/tokevojaziferez.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/69be91e9fc83a22109dcddba2f5bfe36/74441261278.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/15928473335.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/48507859881.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c33530ec---jukotom.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/wusajepimevufakopina.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f593b7180---47685750347.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79a4419cb3---37728832444.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e634d412---muligurune.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/7709caa917f21f51f4b2f9f1f3879714.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/b1efn7u7bkpun7ersqtf9ihnb6/27837568818.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/vegaxajomuvuwukopemado.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/rupelujogaduxazofo1620813156.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/51736887996.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/fokagenuvibofe.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/napadusulixatumok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=%C3%BCtopya+kitap+%C3%B6zeti+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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 10656 bytes
SHA-256: 72ba77de07dd17a13c58a150b099d8e05011ab597d3c7dce3361e43e5a74f7ac
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 18368 bytes
SHA-256: 3dfa3bcdb362f2e206e5e1220a4d2ce74da5502604381ca566f7169bfece1c12

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