Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3342e639a3565e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 14:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 457693ac4eb1c35dc4c1b4c41cdc9b05 SHA-1: a488236fc3445c6f9314351485450f0973d0bc90 SHA-256: 9d3342e639a3565ec7ec5a1e0a2f9e4132322d39ffb0052d2f2a02c2ba9a4ec4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicative of a link farm designed to host malicious files. The presence of a 'Password-protected archive handoff' heuristic strongly suggests the document is a lure to trick users into downloading and decrypting a payload. While no scripts were directly extracted, the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://diarch.in/WYSIWYGImage/file/jolerufujuvalub.pdf In PDF document text
    • http://lamorenj.com/userfiles/files/teleze.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemiwomixirawuvabi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6aa30adb1---lovokigovugulelaliri.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/15688481074.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/26719648553.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161409416e7e17---8910116000.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/jowelida.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/sijatavivexevulita.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210905211322.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1hnino7rig975d5goq4bo1qjr6/887824076.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/7944258736.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2090b685f---sipomibime.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tep1jlt6ej7sipj1jv9b2fja7f/58794167838.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/retorepixa.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-08-55-57-37.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378322b5420---11835497125.pdfIn PDF document text
    • http://congtyvima.com/images/Download/poposegugexixiwewisofijiv.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30cca9736---setisewadubikaxor.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/75575803983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wwe+download+for+ppssppPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fecbbd2c3---texawo.pdfIn PDF document text
    • 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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 10380 bytes
SHA-256: 76879f205c9aa9ad9ce08a30354171bb11e6938718707392547c460d19ec6d96
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001125e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 17436 bytes
SHA-256: 7d59f09e5a1d2f544a56e6b7b7db12f5d8e157f5feabe605d61c1e0bbb294e63

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