Malicious PDF — malware analysis report

Static analysis result for SHA-256 e817d6f73acaba68…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 09:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 885dd1728492eb7c82b3ca0a1b1368ca SHA-1: 2becc63a4e6d9ac3cdae00f74bad16792bea28d2 SHA-256: e817d6f73acaba68cf537bfa99d95f002de7b44d6f134a2573437b8f1d022bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=how+long+is+thawed+chicken+good+in+fridge PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739801aa087---34871484013.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/69591202312.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/v6p3pot2hja33vt2pnrqarjofu/vozefafitibik.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/83039976090.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210825210039.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af520cc02---57519521580.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/lirozinazixukajor.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/tonedonebabokidoworow.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c9382976387a2186f9a0753791cd5ec5/kodasix.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/9v8s7rgf4ofap3890gqfjcmmtu/ranezom.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6ebcf00ef7f194ed0f3ca53248ce372e/39363437974.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/da4ccb8d4bcdd34663ad3c757c37188b/28520043944.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/punikopanabi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160975d7f4d1b2---dedigutokeriguzujofag.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/25041850046.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/fuwami.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/xufozanoxixoxedujajulo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/q3u4ub34j4r3tf7v4t6crtb264/gotakowibeke.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/xusakevafafo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/74cad789eaaff9afc843ad7be79fca17/kebisilivex.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/98318629140.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/868oqdou2q3lne3p7j4vmcc3hs/85163413372.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/jokebupi.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/38459781118.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fitudowulalamabozaxi.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/67981856530.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 10924 bytes
SHA-256: 553c58aacefa82fe1301ff8cdb2f1d6e5cca27681ed89c2de8bbe081dd3ed8b6
font_02_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 17924 bytes
SHA-256: 5c2d8bb7135667d853e3a8ef35200df4e9a4dba96f2e0c19a0ee12771eb4d325