Malicious PDF — malware analysis report

Static analysis result for SHA-256 23438a00b7c092c5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 11:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08cd11f1017c1473c3514dd9f5ade8e5 SHA-1: 276c08b3e90ae5594c1704d3fc073bc16dc01660 SHA-256: 23438a00b7c092c5e6a9b7b12325b5771afb4f3b22f8dcbd89c290954977f7b0
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7177

Heuristics 5

  • 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
  • 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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb25ed3139---17804967057.pdf
    • http://purepoem.com/resource/docContentImg/file/2021-09-09/9eaa91925bd81513b963abcc7ead99a1.pdf
    • https://marsanz.pl/uploads/fck/file/kebanalivofelegavejizogim.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tbipsuhbrajrkp2com9nq0j7uc/97083222007.pdf
    • https://akgoz.zemta.com/uploads/files/ladosesa.pdf
    • https://ytdrive.com/CKEdit/upload/files/18368313999.pdf
    • https://www.hosotte.com/ckfinder/userfiles/files/zufutanogadexajuxo.pdf
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/19546253113.pdf
    • http://air-separation-supplier.com/d/files/89740729860.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6f41414f---67413558402.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141bcaed8802---30421728156.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cddba1aa8a5a17272fed5648e0318bdb/71658619494.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f4bd5712b---xibinup.pdf
    • https://cahayaapi1.com/contents/files/42794432647.pdf
    • http://wksx.top/images/userfiles/file/nisunibojo.pdf
    • http://mamolenasnc.it/userfiles/files/zifeku.pdf
    • http://awards.nl/img/cms/file/jotetodejoposobelara.pdf
    • http://topoint.net/userfiles/fckFile/20210907060359.pdf
    • https://questyme.com/userfiles/file/wumope.pdf
    • https://floridahouselottery.com/test/userfiles/file/75431247654.pdf
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/22524480586.pdf
    • http://zaintik.org/files/galeria/files/44260049652.pdf
    • http://3xlove.com/uploadfile/file/tagevupawubadomeniwejirew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=assumptions+of+dependent+t+test
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 16792 bytes
font_01_sfnt_off00014437.bin
01edbc655b3a68f7281ea86d4fd7fb3f7b5f0c42e8542276c2ddf73edb97ced9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14437 10432 bytes

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