Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de6ffc7dc38a206…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 15:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 763ac4cd2bfd27b267d025c9f14cc6aa SHA-1: 7aa22245a0e3a180619e85c2d64bc9813bca5294 SHA-256: 9de6ffc7dc38a206489c0014912ee18399ff56ab1e071f64e283b33c75394cfd
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress uploads or disposable hosting. The PDF's structure and the presence of numerous external links suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://geometramaurotozzi.it/userfiles/files/kumiditazivaneteren.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/96b3380503387f57a1b91ef1ab5ebf34/34567195026.pdf
    • http://drivingschool-brno.eu/files/wijimoderumut.pdf
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/3003042666.pdf
    • https://landtop.com/filespath/files/20210904141754.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210901_4C24C38207B08A40.pdf
    • http://fongyoskert.hu/userfiles/files/pelojaxekalabarepas.pdf
    • http://newbiesites.com/userfiles/file/votunudubo.pdf
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/6130389286.pdf
    • http://lavalnerina.it/userfiles/file/68987642933.pdf
    • http://sky1981.com/asset/uploads/files/17026648909.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161349f7dedf58---mirefenupifejikupomumi.pdf
    • http://zygzak.eu/foto_dane/wysiwyg/File/42443077548.pdf
    • http://seyrimerdin.com/userfiles/file/71740371271.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6ceb514473d2c7ca69e322b9eef0997e/fupuwowiru.pdf
    • http://www.examnotice.in/uploads/files/60469126250.pdf
    • https://limblength-sldf.com/userfiles/file/77462594401.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e64a479e85---sorekoxukeve.pdf
    • http://feriaalainversa.com/uploaded/files/49897106437.pdf
    • http://modern-pro.ru/files/file/40805568742.pdf
    • https://calprin.com/ckfinder/userfiles/files/85220458777.pdf
    • https://tradingcall.in/ckfinder/userfiles/files/kodavejafutizevi.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426012845bd---gidak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=new+super+mario+bros+2+nds+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d243.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 16792 bytes
font_01_sfnt_off0000ea55.bin
195fc1a11c9af1f79fc4c4ab0bf8d2d6865f2d8907542a05d8ef91dd6711b545
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 16656 bytes
font_02_sfnt_off00011569.bin
99f412311b557b2d89ecfe8df090641b70297aa6d4b5acdd544ae0306a663747
pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 10880 bytes