Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2984192e322ad5…

MALICIOUS

PDF

94.6 KB Created: 2021-07-14 00:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77bec6b263060daea93aa867d2cfad2b SHA-1: 9ab201f218975fc957576964b2768a3d58524f23 SHA-256: 8a2984192e322ad5770613833bd2c7db3ef376db7f0d2bd7fca75f831fbd7984
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806f3a412bd---reloxapizewiroviti.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/12100e08f125b6cd6bd52636d2bddfa0/11929402766.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4c8d2491---tevugogup.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c24ba6cc4da---zexawafasowasuferoxinumax.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jf7irljmha064e0e1osmjrjvke/juwomotixigesukugavarena.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ikqgjm3ccnhtenihmk77h0lt56/89177897070.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9263e30c89---37569470825.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/67825007221.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/polefopapubusefinakulijap.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s8k98f23l2m1u9ovb4hdekmf83/14522071262.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/56029635239.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/61235571378.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608befa1c022c---sevinoranejofezer.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kiromurerobisogutemaji.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5cc46161---lapome.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084ab39d3aeb---64778313876.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160947f85263c4---goreporopu.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc17548a10---sazalevaw.pdfIn PDF document text
    • http://rts-3.ru/upload/files/pinimakeruvaza.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/malinufudo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65e990403ef122ac93cbad56996a19f4/94512791062.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f5b3ca360---74579258053.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/16947179019.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/zuvilekajurasilolafir.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/52834304258.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/epogro6fnmm5n2nlmc7qpkkd05/23768398388.pdfIn PDF document text
    • https://razredna-nastava.net/files/rivejusipoxofedoxizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=which+of+these+is+non+renewable+source+of+energyPDF 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_off00010dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 17308 bytes
SHA-256: a044084b77ef138fa9bc71148c03f6ad2c545a06dde2330ed1fd202991eb7510
font_01_sfnt_off00013aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAA 11048 bytes
SHA-256: 548aabca9a564e3df8183f7f6e04fc1a637aa6c979848e6334cb97b5f6593c9d
font_02_sfnt_off0001546e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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