Malicious PDF — malware analysis report

Static analysis result for SHA-256 c972c05cf8d76083…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 04:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9254190fe075672e8d96d8eac50878f9 SHA-1: 257d88681099edd3fb6be372574d5941fe1e82a4 SHA-256: c972c05cf8d7608359dd5729b524be557786d02af2f61a885bff88ac48c8f66e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The PDF structure and heuristic firings strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mygo.com/ckfinder/userfiles/files/pesusono.pdf In PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zurevatab.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/80236856161.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/70250368375.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/kokir.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/2qkj7r6siv4h1oc6nuoa35qgmh/muterurariribon.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/33488027038.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/45059496552.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/68642902712.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/10151547109.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d023c755e---kidajepapemulojinuguv.pdfIn PDF document text
    • http://robedecreateur.com/img/files/dobegemozudemo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078708150ef1---tawedenasekavin.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/senosevar.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a36ec5196ec---nafofirubevizitagezafa.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08c267c3eb---gixuxagorabaluz.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b8a6b4704d01a9537c54f1ca85876882/nigibamegi.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/nibozurefixidiwikudaxet.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/60644071969.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/kutotuveduzuwizixodu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3f9ad161qc7v4b5u3mpjoe0qi6/pisobovesatuza.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160efe5de6682d---ximulawutomosusijofuz.pdfIn PDF document text
    • https://izometal.net/mm/file/duvosasigulu.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/41955814599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2015+gmc+acadia+infotainment+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_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 10980 bytes
SHA-256: 189687692ac1bf153c742619d3574871b441dc9df2eb0402af1f47c1d5e033a1
font_01_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 17768 bytes
SHA-256: 8d5777a9b2be5a744849e349153941df9c673341c52aa23f9a4f5cb7df954fb2
font_02_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1