Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb2808702cddc9b…

MALICIOUS

PDF

91.4 KB Created: 2021-07-30 10:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51421f33d27418ab23b2d40209a2b683 SHA-1: 1cd26fb6367d9c53690d24fd3027e7088713dd12 SHA-256: 8bb2808702cddc9b1e944067d2a84939d48eea7a344569e397c90c6aeec340a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised upload links suggests an attempt to obscure the true destination or leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b49950002f2d6475b6ea34d1344b7b9b/12744568661.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///70521741565.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/filafivobukewitusivowul.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcbba7decd---betefisizan.pdfIn PDF document text
    • https://totounited.com/contents//files/bolulevoforudax.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b7fd12cd07770026afe6a23cea79386d/zejivisumadoberaj.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fa24e2108---midizubasuzunum.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8b920809c4c6a75358b7799bddc91af7/xeparireguxat.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d68740d10e---xovotawolevogivugejawifi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e00dc18015---88131766425.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edbf92b707---nixikisaxeki.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wugufenagajaxadapa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88b5650da9---61588118008.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607438017a47d---fobejugaraxuxurexikukota.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/giminiruwoxegawot.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9e5c85dc---pulezadanenikozev.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1df495e87---nujekusufareritilukaxol.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/u9bpem9uri7149pvoqskek99t2/54493262043.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4rmrui2f4flujli41ao37qr1o6/5366750700.pdfIn PDF document text
    • http://innersolutions-uk.com/file/toxebelu.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/c81c2f325ada4d8be03679236a5204ce/31458764345.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b59fa6852e3b1692df25b83824b8d971/bewabidubif.pdfIn PDF document text
    • http://kingnature.ru/files/files/tulonepumasagale.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/30497142797.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/37811478700.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/puladikewubabetumi.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/bizesubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mothercare+travel+cot+instruction+manualPDF 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_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 31748 bytes
SHA-256: 645fe5e3ae5a6a55cc6f9cc52d56562e19c64e9e7949b8d26140948e79ff9e3d
font_01_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14510 10652 bytes
SHA-256: e6cd7bf1c20957012d4c0038207c6c2b3a4bdf9b3d52fc9e109c9e75d9ed437d

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