Malicious PDF — malware analysis report

Static analysis result for SHA-256 890eaa58177052e2…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 20:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91f5be4b1da2673ee37ec5dd70b8c830 SHA-1: 97c976d64b9b58b8d0845f1f69cf87030e99ae6d SHA-256: 890eaa58177052e2e7a98674454d693f85233dd4b0f8dc93580ece5cbafd78fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and link farm indicators strongly points towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/fa71616fc3b0ed676e01f96972c12485/nakarupenetaw.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/583f14e29c47f5883139534298442383/wudegiviwoguwibem.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95d63a4f8---ginilalewarefezoropanivi.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849becc7880---xuxabivuvofibozotunoladut.pdf
    • https://yingzhaoliuart.com/upload/file/66135555324.pdf
    • http://fitviewer.biz/files/file/48661750607.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/64208432381.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55612293c5---69865719658.pdf
    • http://classicalgardenornaments.com/uplds/file/16559078222.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2c746114837e1b98492b21f0c3830b62/41896852533.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785b31d0adc---vimutaxowufeg.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b252557f4---daxafogodalugudotatiz.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d4e9d9caf---rilofajaran.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a802e674ec8757cf1f3ac9c937a05d76/33741664264.pdf
    • http://archinfo.ru/uploads/file/rudatifapuwuvukutenoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wow+holy+prism
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f5.bin
868264df71759869e38cae07357f1c542bfe83621cbb1c6e8bfa5a45a390a94f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 10212 bytes
font_01_sfnt_off00010ad8.bin
71bcd3c74075593184129e9fbcab33f279cdf5b63c9daa575158cdb1fd1ecc87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 18016 bytes
font_02_sfnt_off00013992.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 16792 bytes

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