Malicious PDF — malware analysis report

Static analysis result for SHA-256 6464b5b4628fd1d0…

MALICIOUS

PDF

71.5 KB Created: 2021-09-07 16:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e91379824d088827558cc901ac97bf0 SHA-1: fdc151cc29383b49b9048e2c82b1bd86f2f835fe SHA-256: 6464b5b4628fd1d0b875d2e9c061921ec3f765874f78d49a2f1a2023df09f129
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 domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/tawejibip.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/908423f59821d302c9f44fced950a4bd/pubufidosepevupowiwutuwe.pdfIn PDF document text
    • https://shinaltd.ru/images/file/98772685050.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/dinuzajetotig.pdfIn PDF document text
    • https://termofriz.rs//files/18732369585.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/12826984228.pdfIn PDF document text
    • https://bfull.ru/uploads/files/55898601096.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d9dfd7498d96526f9f51a75e40471cb4/8685865975.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/27350656197.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f78daff400f---44533051974.pdfIn PDF document text
    • http://aweibel.com/Photo/file/mirakavetiguwunigagabomu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070c95116692---kevabiravam.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/73da29252270cead4098a012433cd0ad/80517749941.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202108241501353166.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/3f95abff83e40f4551a248ca43b76160/56270877336.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/218117e9dafd2dca9547f358773f623d/jidekonotop.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/bafiwura.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/webukori.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/df2d2fb13c2132a3ca8e03d5abda8719/10655461993.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a3f40c7971f3721b527f0501e6aa3e14/mileruri.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16123ad003f428---62999872011.pdfIn PDF document text
    • http://shamayachts.com/upload/file/91457655638.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/1937181999.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/37474183069.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/51572910400.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3dc8661e6---zadogovisizegisipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pentatonic+shapes+guitar+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_off0000b693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB693 10956 bytes
SHA-256: ac80a5d734360307e56cb2f2066f723094be1196c67da57cf0315c078f2743fb
font_01_sfnt_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 15896 bytes
SHA-256: 318cf6bef377f0e90c323f860682e4e656a3f84449ac89143073c268d844d3d3
font_02_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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