Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3825a18a8a7536…

MALICIOUS

PDF

87.5 KB Created: 2021-09-21 05:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f20581f04433c8f983527d053b45389 SHA-1: d5a81bfa90f049ac4dd028ec704d11c3900ac4f8 SHA-256: 5b3825a18a8a75364774f2c11fdd7ffd3772fb7bf69ac89fedc2cc9958934057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various URLs hosted on potentially compromised or disposable domains, disguised as download links for software. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute malware or phish for credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://rachelrom.com/rescontent/file/jorobexe.pdf In PDF document text
    • http://c-six.it/userfiles/files/zimomozuw.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/19007146998.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/53518683410.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2a2eae0c06882b7fc1e359341446d17b/xagetow.pdfIn PDF document text
    • https://camphacement.vn/upload/files/zaxalopepekumomuwiguno.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210907101655.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/torugitokojagewefefon.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/sozujepazafupux.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/51381121125.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/11832937148.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gikajozekipemaju.pdfIn PDF document text
    • https://dalba.net/other_files/File/35094902985.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd147e1d5---95310303522.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/65616252727.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/wegawusofad.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/xatategekivoxafa.pdfIn PDF document text
    • http://standardamulet.com/files/files/vogegododijapap.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/vubawimarofurifa.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/darizegofiwajija.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5e1af89a73dd5539712e8973706c2149/poxavuzimigibukuzadamatax.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/36842057032.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/lemanukanexezokafifabeb.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bawuwebojemuvopufuzixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+samurai+shodown+2+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 20332 bytes
SHA-256: 896280807d0816f7dc227cbceb8255f1362495b6ccc0f51377a298f55c502103
font_01_sfnt_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 16376 bytes
SHA-256: 2bc61d1bff3cf04bf374f9298db3344566c98831c2b265bdfccfdfd5c103bb61
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 10592 bytes
SHA-256: 369c18951ed3d689777c6ef7c54dfc06940d43d8f1d507829113950a3a66d18a

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