Malicious PDF — malware analysis report

Static analysis result for SHA-256 b847b2c0cd4e93d1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-25 07:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78ff8cfb798890dc030a11b127d21ecc SHA-1: 167b41ebb483df36d702c83285aa882dbae0d027 SHA-256: b847b2c0cd4e93d1b578a59ef6bf91f479e53d5d8f7bc0f6632dbad9b62b0653
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting it functions as a link farm. The presence of external URIs and a compromised CMS upload link further supports its role in directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://honkakuji.jp/honkakuji/images/ckfinder/files/sofalunolufipenubovisupez.pdf In PDF document text
    • http://kartelabasligi.com/images_upload/files/51266023922.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/jalib.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109121632162884.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/31470734718.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/bokajoxugoligibevanosize.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5533da856---3344381646.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/xapamuxitit.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/sinawisevepajizedaj.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/22026399974.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/26584666209.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161311ff0b44ea---godefiselan.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109130916141295.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/37013445034.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c2ce1640---58683401252.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/71294792501.pdfIn PDF document text
    • http://balone.net/_upload/file///35839893102.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/wunad.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/bisoromupisipabasudarili.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/22945789481.pdfIn PDF document text
    • https://akconta.com/uploads/files/98256002394.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/bevojepagef.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/rinisuxu.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/dupovokabetetukisaf.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b65a8651---69994333430.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/defuniwoguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=iphone+11+plus+price+in+bangladeshPDF 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_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 19560 bytes
SHA-256: b34c5d929686fbd842d0fa4d61621faaaf8d026f638410d0c23e54744856cef3
font_02_sfnt_off0001110f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 10936 bytes
SHA-256: de5ce69c1e19022ea22dc4d3d43ee1ddc7fe6acb9819e2f8b1954122a9f40f36

Open this report in the interactive analyzer, or submit your own file for analysis.