Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b5977273494ba4…

MALICIOUS

PDF

91.3 KB Created: 2021-09-11 01:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77efe2f5efc1565f88418855004986d7 SHA-1: 0a328f0975b36a56b39b37e3be92b0c6a218561d SHA-256: c2b5977273494ba4fba45a04b972f80e43c7253f78faab354741201f47369e94
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://heathrowairporttaxi.website/userfiles/file/52131732696.pdf In PDF document text
    • http://rainternacional.com/userfiles/file/xexararetemufutu.pdfIn PDF document text
    • http://freestyler.cz/img/file/terejon.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/1634436658.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/32895460541.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/44328077098.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137b739a455c---levelinak.pdfIn PDF document text
    • https://avela.md/userfiles/file/kapidonavopezenelasone.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/39514674305.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/55734484313.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/mapagenivatabuzunegapatib.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202198144930.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/4993156261.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f0eb872d---negototebojoxofubage.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/6280060622.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/lalovakopiwopajejagewo.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/86049658377.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/zemodavewigaselo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139dba0e2b48---wibuguku.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5u2vqho17ahc4uo73au8h9mqrf/xelemitakenuvixadesan.pdfIn PDF document text
    • http://gptools.net/userfiles/file/lorapiv.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/2butfn41nmph4c297of2nl7r2v/kepego.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/81464271660.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/5751021533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=deesha+indian+grid+appPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 22532 bytes
SHA-256: 89b834057ed3d9142f70af90b9f0ca6ddfc21e9c11d00a2e998a5787959941d8
font_01_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 10408 bytes
SHA-256: ea51c276dee540899b8550dc4852abdff30607e6e6abbdeaaab8f61646595209
font_03_sfnt_off000149f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F1 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973

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