Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc35620f5e291f5d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 04:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbb59fe867018666bd65bb5322f01005 SHA-1: 190c8313068bd359715f459bd6d21935be0bb671 SHA-256: fc35620f5e291f5d9da45ab3e87553a1cf15978b41adc6a52e074a0051e0656b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with URLs hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs, many pointing to unknown or potentially compromised domains, reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://takarasushimn.com/userfiles/files/nurorapuvanasew.pdf In PDF document text
    • https://osakaav.com/userfiles/files/63010254868.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cfe44c95b5117f911a556e75109b6e7/89460056225.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/79450498433.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/77070541860.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/27859759473.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nazukudas.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pivun.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/zikupefanajakez.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/95584036217.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d28d64eb8---92907069916.pdfIn PDF document text
    • https://servicepapik.ro/files/10228691073.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/39510993584.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/22633879940.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/bunewit.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/wugapirinevizefiten.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/nolivovuxegomikajagevowa.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/78309880668.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/55512515080.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140494ab5f50---kuberofawawufim.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/witolumux.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/jeletokogerovesap.pdfIn PDF document text
    • https://finliz.lt/i/File/23919216916.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091602485073499.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/98084144287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=frozen+2+full+movie+in+movierulzPDF 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_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 10268 bytes
SHA-256: d93691ee598414cfcfa83ae507c7d928fc4a282d6418ac1655d8783bacd802ca
font_01_sfnt_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 17224 bytes
SHA-256: 8016737f28215607996ac452b0534c6b5e415d1bb10517663f14467daa4cfd87
font_02_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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