Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f2d29c140cda71…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 17:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e915a2d8ccc97867006a79669d5d027d SHA-1: 36ed218c7bdac1436949fa361c4a13e45d9e3e16 SHA-256: e5f2d29c140cda719f7480169e52bac7e5fea44113c5b69696d6f604bc870411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable or compromised domains. The document body is largely unreadable binary data, but the presence of numerous URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://myphamnanyno.com/luutru/files/mujizalekofederosevi.pdf In PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/nokuvaf.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161494cdc1418a---berobejin.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/85467306169.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/fuvadutomine.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210908180922.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/89586328278.pdfIn PDF document text
    • https://coil.hk/upload/files/kewasiriguzuruxuv.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/28135605022.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/44845540682.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zewuzewadafajipufig.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/54359531211.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/7400699092.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f30eb51301---82387562610.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210925071410.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/76471516804.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/66869325952.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79642893044.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/jijadumafugijunumadole.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/82435382371.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/1286041735.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/revikudunogetilo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb9ad64602---19729765117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=game+split+screen+androidPDF 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_off0000afc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 10716 bytes
SHA-256: 382800375b402e9320b12ff3c1b9712aac861ac5eebba346a11d35b93a2d1398
font_02_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 16244 bytes
SHA-256: d30de60cff2d8cde04a463b5e858e9154e917b4a09c95840d11e1f630d2302b4