Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2452cc27b32ea3f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 11:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d7582da71288091e9a51b420b041bca SHA-1: a5c2c47db3d31754624e7fde5d848c8d6d54550e SHA-256: a2452cc27b32ea3fcfeb9e193de7409a0563ca1c2d9a09e0c2fda6f9de3ace57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ventiliatoriai.lt/js/ckfinder/userfiles/files/fedaxirukixekure.pdf In PDF document text
    • http://benly-carson.com/product/files/63612848324.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/46cbe67891c9affa84420d3fc940af6d/92091901008.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/zumajab.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/dizexefizonezuka.pdfIn PDF document text
    • http://schokofontaene.de/idata/69039691990.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xonetefimaw.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/kufumapuniranerevazejowu.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/sunakukov.pdfIn PDF document text
    • https://slotpt2.com/contents/files/29811982812.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/vewefogojijazasajaj.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630530825_2ad848a803.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/9683948098.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/81349332993.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/82366130129.pdfIn PDF document text
    • http://freeorden.com/media/file/40418211456.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/volakudazapuperozaxok.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9763e68d---76840898141.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/sajojorokosoluposopeneto.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8a3f767b4f2ec9ae871eba2ef7d40b49/25860808224.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456068b3281---57854049097.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/89548768169.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/11557981472.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/12551443612.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/19374476210.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/disusubezed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=english+language+teaching+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_off0000bf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF10 16656 bytes
SHA-256: 76868a8f7c1b26bfca4513f811bc4826823360b6cb449c24412525c016cd3349
font_01_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 10760 bytes
SHA-256: a8260f05b15a76a6ee271636453d7fbc0596bb3618adfe68755d33ffd9ae267a
font_02_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1