Malicious PDF — malware analysis report

Static analysis result for SHA-256 070d1023f9708805…

MALICIOUS

PDF

71.9 KB Created: 2021-06-05 06:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53ef07fc8a3b90025fef6c7762a37329 SHA-1: 6d7376aeb95d38325f165d8aa6e1905bb3a69522 SHA-256: 070d1023f9708805b473d13b6e2fbb10f08c7279a30eea3891941175ee32becc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body, though heavily corrupted, contains references to 'Sea of thieves download error pc', indicating a lure to trick users into downloading a fake update or fix.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=sea+of+thieves+download+error+pc
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/7c3ab4eeaa7f8ad8324cd55de5884174/vulupow.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074b62a1fbd7---57903808009.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82f5613a0a---xonogabolakakilotikelusi.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45ef3cfd9---levomepoduw.pdf
    • http://romanakladatelstvi.cz/userfiles/file/78834375386.pdf
    • https://aawyx.com/sites/default/imageuser/file/30283224767.pdf
    • http://funperm.ru/content/file/difebigigurarovubi.pdf
    • http://mwflower.com/upimagesfile/%5C/40565188233.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e4220a0f7b4f6261548dc6fd40dfe1c/75994384431.pdf
    • http://10glazsikeyrosa.ru/file/guxafiwabosuvegowejimo.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6818e2476833585f24cf1ca5b490b9e9/30956366595.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459e98bd05---renojosejadozibefurozo.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/49111733957.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nmpar7akj15fbqgllk8tgqapv1/97695398333.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/dupeka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pro.ovh.net/~tribuene/images/banque/file/43972303253.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0d.bin
15aa0d47eac04c7c95ccf8a07f6463806844adb917d2966108f96c2c55249b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 5496 bytes
font_01_sfnt_off0000edd4.bin
5122f5e3652e48ee591c4e0303fb2ab95006084d46daf152eefb412b7dfcc04c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 10668 bytes

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