Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cbf62ee0be9a91…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 16:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87772e88e5595a3ff5c315425875356d SHA-1: 9420caf3d45b789dd268e81099844593da0d969b SHA-256: 44cbf62ee0be9a91d5413b4902649eade623097682b7d98d0b95d324218073b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous domains, some of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to download files from these external locations, potentially leading to further infection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://szyoujin.com/UploadFile/file/20210909064912507.pdf In PDF document text
    • http://sportservistocik.cz/UserFiles/File/16425373536.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f31945b9---sutorobino.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a181007c---xobizorelusep.pdfIn PDF document text
    • https://hsse.cl/files/12066077189.pdfIn PDF document text
    • http://sin-hua.org/userfiles/16174919641.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/54547403943.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/27563801016.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/fewukebobajetapa.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/5289890704.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090700481570554.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/xipudebewefelevilinu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/35148069362.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/gewibemidafu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/bfc2c6190a6d062c932f6545aba7292f/kodufe.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/15483679e14cf13aaaf2efba8f4ab25f/jamosebejimatovomexe.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614951ef172f0---84629413444.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/25846827920.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614908d2e7d67---femixefaderiwarilusu.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/vodaferej.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/58124246342.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/vexomabowidimodavirasag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=holo+launcher+apkPDF 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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10296 bytes
SHA-256: 08166ec6e571471cec595c096e6c745e951eddd701876a9dc7560f62d50f20be
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 16472 bytes
SHA-256: 6dc313a245ae96765b55b970f77c38b6da6370e95b7f4a819b4f9f9abc4ac115

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