Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd9070ca05d0bb3…

MALICIOUS

PDF

93.0 KB Created: 2021-06-29 02:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 11a7356b9d7670bb6e74093b3493c256 SHA-1: ccbc48ad699208fc59ce285e9469ee7fcca62885 SHA-256: dcd9070ca05d0bb3869ee64762b1b27583c241a5567acd69b391563621859c03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb676fbb1---bosumososijafidafilijef.pdf In PDF document text
    • http://jnafarms.com/clients/864068/File/16426265878.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a042ec4f---zalowuxilunalufa.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e08aed5a---45915765185.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b411300d6---gorupanevogasenebepe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///tozuj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958836164a2---92034544053.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a387fea8258---94632317876.pdfIn PDF document text
    • https://telenovella-bg.com/files/sevewiged.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928d27039ab---93967337751.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/4708e8c82fefcb8d2dc740b0c35cacf5/80776436834.pdfIn PDF document text
    • http://slsnn.ru/content/file/kulutiledejiraxab.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/nagatidoxuwixesuduk.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0et8irtm2qjcl88ma8tqvvhgmk/90354686185.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/30514ec1e2418176325fbddd089c0075/gixudikipo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a85fba84347---14858027868.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9611b5af3---dexada.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///50626454646.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/977c021653d6700f44b374bcff2f1134/rekogegalofawalutorem.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/878b3e8ff5946979c9e14deff80965e5/82239000767.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089365a52416---loxedob.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/ab0322c97b5410e0eaa9df2240625cc8/84915169357.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/fupumekivifuxab.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/87153785745.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/rupuvaxabatolebadijew.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/11374394329.pdfIn PDF document text
    • http://www.minecraft-downloaIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+minecraft+1.15+free+full+version+pc+java+editionPDF 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_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 21988 bytes
SHA-256: 80ca3f0071a64292a62a122e3a3df70c720abb38c0029e2c7701d10c48c400be
font_01_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F8 1276 bytes
SHA-256: 27cbb17a90483c5fbbac2d53a24e669d235fb7e3d4ec2ab4ad5a18d6f1c17726
font_03_sfnt_off00014a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4C 11416 bytes
SHA-256: 9fe1d5ba16ff923656cb722981eb8a1d26d46174aad1e6c875fbbfd945372232

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