Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4abb52f3b0ebe02…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 21:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e27b51b8c267be68138f7122baa9b8e SHA-1: 68de07e30aef7a8658ffaa050d0976274c652c46 SHA-256: a4abb52f3b0ebe0210bae23855626b5e85310e353b7c8c708f820254e14e17df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://wastran.ru/uplcv?utm_term=android+11+wallpaper+4k PDF link annotation
    • http://5percent-design-action.com/upload/users/files/jeteru.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/88469377110.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210929063525.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20211001002023.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/159786525561331fa241f5a.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/pulekidununojexa.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/60058410858.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb2ed7190---tejedibibetegex.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/4947361877.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/55912302689.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/80763687967.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/47130087780.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/303b4febd0d036dfa04bffe092c3efd0/56333996066.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/21130006920.pdfIn PDF document text
    • https://dptech.vn/uploads/files/zudoxosoxupe.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/49061513337.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/44de8144057e96390e52d8d5c2be3086/50413876206.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tabup.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/selexuximowekadatu.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/rijunutim.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/luwoxegedanifojomulejubu.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/21990160791.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/keremodisufixex.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3bd08ef97---34792806881.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/guteparidarupizikux.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/42306540689.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/diwifinogelav.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151e7bb9d32c---lozaxaritabirif.pdfIn PDF document text
    • 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_off0000b381.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB381 16792 bytes
font_01_sfnt_off0000cb93.bin
a6d38e7f41db41e54fc508da2eb17bd13ad06fa1016d6406f2dced601aebdb34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 15208 bytes
font_02_sfnt_off0000f1ad.bin
b65e3e736dd878b93a8bac0e400530c42d0710dc4e2472e1c53096d97feba799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 10408 bytes

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