Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c75aa2f953fccc…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 10:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56c73560bbce75cf829cdd9d4cbe88ec SHA-1: 31754b38a71f00b6110468609ae5aaffeb69144b SHA-256: c5c75aa2f953fccc3b721f4436fd958f118720cabb2a659386b982deb6f670a9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hankyunget.net/userData/board/file/2469653169.pdf In PDF document text
    • https://zibarajabi.com/cache/fck_files/file/vewomanopuguzex.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/bowafexaxasivenodimub.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/xarefapewanemug.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/88540874891.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/2228095796.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/39022007937.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16144439d3b4f1---29034957790.pdfIn PDF document text
    • http://abpaluso.com/upload/file/82434046325.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/56013612089.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78595c185---detemosiw.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/puxiri.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210904_BFB4E9208FE64FB2.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/widamipoz.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/paxumomarenajobut.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/karadejokakeperisigaki.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/43133346460.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/75335506136.pdfIn PDF document text
    • http://kvrhousing.com/uploads/94926306252.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/57180544859.pdfIn PDF document text
    • http://thaide.org/userfiles/file/jilogome.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614017b35c423---27547924900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=icon+ios+generatorPDF 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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 17660 bytes
SHA-256: ae6bf33f0cbe34fd8c9393b9e08974de3f15b110b2106df93d15c3ec1b61afd8
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 10308 bytes
SHA-256: 51b64818fe0456092c401fb4d32934ef2868cfe78acf5cb6a0831087df9fb5e2
font_02_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1