Malicious PDF — malware analysis report

Static analysis result for SHA-256 984128566f201c3d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 02:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d38fe0efdf27fb6159256285b0c2ef58 SHA-1: 6db987f951e85f8d56a68832d8d3906f43352eef SHA-256: 984128566f201c3d62c48e7fdd5f10a363827e8eb1490c0e107bc7ce90726ade
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kondicionery-himki.ru/upload_picture/file/demejuzubanimu.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b616c351f---51942427112.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/wekemi.pdfIn PDF document text
    • https://webhosting4.net/media/file/bopepipojagi.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/20707872612.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/bomesominonewuvixulitas.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/20854910638.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/komolodazuluw.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53689487293.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/35213296875.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/kubewazunizudezelewom.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb20fb07c8---konusejivipu.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210915150416.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/41962161503.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109060806599416.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/62312721143.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0b12483e---69715843982.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135a03bd3f0b---xositinikos.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/43178119091.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/18998111301.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/pikumot.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/23297403366.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/96211102037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=spongebob+moves+in+modPDF 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_off0000cc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 10612 bytes
SHA-256: 97ea86d42e88331d8a3a29653d0d6cae2810eb167b461fc0e455f5abefbf51aa
font_02_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 18008 bytes
SHA-256: e4169c9c73e893f10a7e6b2714369a19df4263077df04967f0e1cc87b0a57b3a

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