Malicious PDF — malware analysis report

Static analysis result for SHA-256 f775467c4cd21ce9…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 02:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 766330cdc5710aa824a162bd80286f26 SHA-1: c05873d569fc4bcd5cf58035f6ceaa780829812f SHA-256: f775467c4cd21ce9ccb0af155ddc05770ea73faf2c1bba13f3938ee2213a34ef
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations. These URLs are likely intended to lure users into clicking them, potentially leading to further malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f68cb93fe71e6c914de14d14c4a878be/pefiforirubezunofi.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/bukiwerugimej.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c34938c1f7---6842849992.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e689f17872---bowotivudaxavepe.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e7b1385f3---buvuxoliduronivuxo.pdf
    • https://soudurelauziere.com/upload/editor/file/pejojinuwupojetixebitu.pdf
    • http://mientaytourist.com/uploads/files/didoseroza.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad35abc3c---powegevobesuvuxomeki.pdf
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/figumowegokewozawona.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/wukafididot.pdf
    • http://evevoyance.fr/adh/.-/file/kibelilovajizajakelukiti.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160740c7add68d---falari.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d7b4d98bb110eb288b1270d5484dbcf1/92373962513.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/5r7k8omffj05u2qk569ebbj2ae/14907639556.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dea87c88fa60af668517dffcd268e3d4/35406502968.pdf
    • https://landbondcorten.com/attachment/file/99fb33ad0d2894d0263d19735919cf2d.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/arlt4jb99pgphf7gjmv3c01ln5/ligurafu.pdf
    • http://icltindia.in/userfiles/file/36893061097.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160817c1a9dfcf---jazer.pdf
    • https://bjsteelvietnam.com/upload/fck/file/57965140948.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/62ff587827f56b42a80fcd727ca4e720/voxopimurupup.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fcad5044---64972984868.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=find+a+quadratic+polynomial+with+the+given+number+as+the+sum+and+product+of+its+zeroes+respectively
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b1333221ad7b4e2ec7000f98c88a29c3/negezetu.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://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_off0000e221.bin
8482ab5425f2e40d4a2afc67e292346eeadaa7bfb07491c7f86093c7f58c2110
pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 18084 bytes
font_01_sfnt_off00011261.bin
ea9ff36c55c33ab47bc2f9db8261fa7b53c7b9664d541151cdef22b9c973a291
pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 11756 bytes
font_02_sfnt_off00012d9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9F 16792 bytes