Malicious PDF — malware analysis report

Static analysis result for SHA-256 0888b9338c90e791…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 06:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1f423e4267f7ac61c5699f61ecbe90a SHA-1: f1cde7259e5e8c9aa0a351716a3c2e82215a18b3 SHA-256: 0888b9338c90e791c3ec6b3af33562be1bdf96612a13c495c592e07a96c270f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malware or lead users to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent. The use of a link farm is consistent with a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rajaunited.com/contents/files/72574927063.pdf In PDF document text
    • https://matfplayer.com/calisma2/files/uploads/fexoduwufubix.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/fupizifedafi.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/tevidupikizuju.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/kagijadaxuwa.pdfIn PDF document text
    • https://5uempat.com/contents/files/marewamubunat.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613236adae6a0---gojumubap.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/fiwidededijejozofumotosek.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/posulekejerumo.pdfIn PDF document text
    • http://christopherdallo.com/file/domisutapugufofejono.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/71513359720.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5acfb918667aa6a0904d3923dd26178a/78093795532.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/tawunubiwef.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/58486085539.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f616746c79---nadijetusenetu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/14e02637ebcadc19584c91049ce35535/69084174489.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/50304415752.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/db1pfdhkkn3vvur3pfstpiee1r/pozopomemukalix.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/39252193309.pdfIn PDF document text
    • http://citranco.com/users/files/medanubexipalo.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/78978700100.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/14224241924.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/kujimiluwezukemuzokof.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/zozakuguje.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/dimetejonuzokig.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/4006429572.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/sanadawaveguzol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fall+of+ancient+chinaPDF 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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 10140 bytes
SHA-256: 22f5a2db801609ed3744cb1e4418a22c5c4e46d32279eb36a4f0e2daa40850b4
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 20632 bytes
SHA-256: ddc4b56049e963b47253edc12e6aee63182fa5c09db14d0e471dd68711acb3aa
font_02_sfnt_off000132e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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