Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12982d19b08ee1c…

MALICIOUS

PDF

90.7 KB Created: 2021-06-30 02:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0a56da56f9bd44a8abd23c45696978e SHA-1: 1061012d1bbca33b42f039355f156a04b2e33fab SHA-256: a12982d19b08ee1c46439d67b65e87fd9029276570cd494de7ecc1e25b50beba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such documents for SEO poisoning or to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/7589gn6vd6nfirrrfjht4mlo04/pokerodaka.pdf In PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ba04131f35095ea26bc326b79a53a915/21255889224.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d4b8df4d---sisivavizoliserasiwavo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160857b370b7dc---watedoxewubow.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/28002901297.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094519d8ad0d---19388504434.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/49473722456.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/vugedulubexoligunozara.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/475cb4ab395f2fd835882d0cf8ad613e/nuxezo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b2e1dfe6fc06f938d03bbeb6fb56f53a/83938170065.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609172f4c9e3e---jotule.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tidazirunutabajudufevape.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072d988147ce---larafotemijamuzobatas.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd2627589---36372982220.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/59739753614.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bea988459a5f32dfceea527577b59062/61502317797.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86bf61f3d---61826863122.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/81479266841.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fdfca1df37dfc8d2805e19d8772594a4/58761925168.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/72016489175.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff505cdd26---93678901988.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/faseju.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e33a8218---bojujesotuxawedubuz.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9cfc223ed89cde19baaa9a4bed106a52/5468659411.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc23ff1baf4---wavidabexejokajon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=amanda+m+lee+wicked+witches+of+the+midwest+reading+orderPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 17728 bytes
SHA-256: c78a73e50e235003a2c5904edb5b4e7129af7125a415b972734a17577420fc75
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 17940 bytes
SHA-256: 7d9dece5e48d5180048fc94d2be428f048c77582832d5b716d6252cb03cf6ccd
font_02_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F1 11084 bytes
SHA-256: 5499bd50f61db438f376315d806cb692340777cd63e2720f6acc5369339d8077

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