Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2893a42cc0f0c3…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 18:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3bf6cb1610e501b0c9c06a65f698db10 SHA-1: 6b7f8d88603939fd40f16a5847117592d3d13c7f SHA-256: ff2893a42cc0f0c31abc53b8ce0129c94daa933d7d014380f78ceb42bca0eb1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it's intended to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://psychotherapie-coeppicus.ch/userfiles/files/zixomenanosuges.pdf In PDF document text
    • http://thaifilmind.com/UserFiles/file/47406353443.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/uf5ls62ojsceuc284pp308a3b8/99655727273.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/menufir.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/wobemaluf.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607140f56f1a5---42156813426.pdfIn PDF document text
    • http://kftchem.com/upload/files/2603890395.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/24e60bc45fdea5a32e16c6833b9543ac/wasawivutulafomuxo.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/56224482720.pdfIn PDF document text
    • http://planetamama.ru/files/file/vetusula.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ab349cd718912759409c05c066540a12/39415380883.pdfIn PDF document text
    • http://sun-eko.eu/files/file/tusidobewonotarewetep.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/vazowuletexutufuxujulari.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3c11115547543f631ef077cf423f3130/bedux.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/xinigejudefuvigafal.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/93700634362.pdfIn PDF document text
    • http://planetamama.ru/files/file/dodanusebapixugovenaxa.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/jonexupikegetoxupiferuba.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/21368288556.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/80871398062.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f779ca68---69390776074.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/h1pudt9qq57cnueu5jtpj1q7r6/xotipiwiwexare.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dojeifub1o5b46r27ran22hftv/vipedewevezugevunovava.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/39596414185.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/nuwawiduripevu.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/10882870938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=business+etiquette+book+pdfPDF 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_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 16644 bytes
SHA-256: 322159c12a3e5779e3dbe83579444b9a2d003dc29cde8b118f7fa1f570335962
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 10716 bytes
SHA-256: 3ba00e691688763e79dcc5ec5509aff4bbc6582bd48b71aa25b92bc65d85fac6
font_02_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1