Malicious PDF — malware analysis report

Static analysis result for SHA-256 9085ed440e9c21fa…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 14:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e30f815ac02bf36dca12939e75737a30 SHA-1: 912197fb428184969eda21c25cb75b638b1de0e4 SHA-256: 9085ed440e9c21fa6d34ab5fd2295f923bd00ca6e0ff40bbd5f53dfd595c81e6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that leverages a link farm hosted on compromised WordPress sites to distribute malicious content. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need a password to access an archive, likely containing a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26af3ca17d---lazupibupevoxusodejew.pdf In PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a4e6da0de1cd1db5d5908d672c77237b/55683827917.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/78894407239.pdfIn PDF document text
    • https://ms02bet.net/contents//files/50867541457.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/78805948109.pdfIn PDF document text
    • https://kristinanamaste.eu/files/74155350761.pdfIn PDF document text
    • https://luminex.pl/upload/file/wolododuvutukikulir.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/79675408064.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1aff6c486159f22f03e11cfc72968ae9/22059801688.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/41d2ac4125b6177f51fe32f69da3fec5/tazuzixiduvetafubukabix.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/dafojalewexitokiwizo.pdfIn PDF document text
    • https://efnnma.org/files/file/kazuv.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/14257860786.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b7e01432---85643322699.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/radifewirut.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/60502585562.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161286151c0fd2---59254179806.pdfIn PDF document text
    • http://allasclub.com/campannas/file/47428461103.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/84798525488.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16126094e2bf0f---negaxov.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/64ee91a14341117fae9708dc54e5ecf4/siwukuz.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/20aee774e3eeda1769fe4332a185df9c/jewonijedejige.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/mivavulekitaxovimepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+encrypt+pdf+file+with+password+for+freePDF 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_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 10908 bytes
SHA-256: 53f82995e91b1e159ed38a60aa04a1ec6cf1bdf66c8d9b52ff22980e6f548e26
font_02_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 17880 bytes
SHA-256: 2499e01da75734236879cfd088f828f9b2597e5994986c07eef19ec5b2619773

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