Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81b357b51c6fdd6…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 00:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e458c10820956644e5ee8678af4224e5 SHA-1: 6db69ef26ee5345f82e73aaa8b8ed057ba83af42 SHA-256: d81b357b51c6fdd6da8b9321f0d8eabad26c49b70023666d0d153aae9a99f286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs and the ClamAV detection strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ekorob.pl/userfiles/file/95125821275.pdf In PDF document text
    • http://officinedesign.it/userfiles/files/vuxefapujuzawowelufufebi.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/sajebomenew.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/58733351212.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3067a0cd7---78031763876.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/83321743579.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612c6edbb8a67---13670100691.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bo64d7mkaqthbcs5lhji6s8fk0/51862105304.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/zavuravulerarurotog.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/mexewodupinaj.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/betuxuda.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fa2c0733b---48705938945.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/31309166921.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2147c8f40a---jadup.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/40100621604.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1892ebcd6105b7045814f5236621d0d2/mojodipidepebazab.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/dua2u8r9os9jkjvdbdufb85cim/kabazofajegopulovomoduw.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kamuxaviso.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/gataxobuzijebimidubapoduv.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/30108792242.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/78385915404.pdfIn PDF document text
    • https://citytrafik.nu/images/file/bowevesuxodij.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/49fc342b840e645f15a12d8ec41de2e3/75065611622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=calm+in+chaosPDF 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_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 16956 bytes
SHA-256: 73f4c54439531a9b8bda827612e7df3c2c393e7548887cf80b3ce7f03ac54ec0
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 10196 bytes
SHA-256: 7e4acc929bd31c1d5e2457896b15bc9a31647e421b76ccdf41e561378c652277

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