Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b4aa78d199d432…

MALICIOUS

PDF

91.4 KB Created: 2021-09-04 20:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba065cb66e6f8f2ac85ccb4610e5c2b8 SHA-1: 49dbc9fa7ec58483a4cade131cb5459ff97d0a7a SHA-256: e0b4aa78d199d432bdc75ef1725d15b549000ed8870f8b7af0b1bc38ca8f945e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://crewmak.ru/uplcv?utm_term=czech+language+learning+books+pdf PDF link annotation
    • http://homespakistan.net/magzine/uploadfiles/file/dojasadexesapuxabaxadumut.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16110b3bce9cf5---petibalajeposenokakatixur.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/90861275503.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210822_D970C2B1B5D104E2.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914a2cc2253---99190331483.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160858b9599980---mofufotawajinijopokakidiv.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/74i2l7j21se205gpcfpfocabea/84958310060.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rirevixejewamapadugoj.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f282ea48f4---gasizetepetawoja.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/eadedb0f427c321595bbbd04fbc49eee/kusupadetapolekezojunoxev.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109011637168316.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/muzisinitosanogumexotip.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f8bc2a6f---pekobizuzufat.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d35ab4604a---45941651908.pdfIn PDF document text
    • https://ever-progress.com/upload/files/26276937810.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/malabezorenofarulesoli.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b69d73a0---tafofixutewizemobega.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/78568431873.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/kalumanedox.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a01f9bcf182---5613801044.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/18608984856.pdfIn PDF document text
    • http://askort.pl/Upload/file/52125101685.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fewevunivofedibajogow.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 11224 bytes
SHA-256: fe013c8737fb4ddbe6e7bcf9d0d292a355e46594eb4be909095802345d2aecd5
font_02_sfnt_off0001308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 18208 bytes
SHA-256: a74091c5085eaa9d3a2360e936c3fffb7447b3eedcff408515a3b2ce0766193f

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