Malicious PDF — malware analysis report

Static analysis result for SHA-256 2751e3b20f3eb1a7…

MALICIOUS

PDF

91.6 KB Created: 2021-09-03 10:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac67a5e0770bb7aadf13ef52a6eb4983 SHA-1: 3f680a4cdc6a580da67b7e6968d67ee2c35a928f SHA-256: 2751e3b20f3eb1a76e504d55386c4a285afcccfbaa2995e8aaf3945d6d3af4f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://philabc.ru/uplcv?utm_term=manual+inline+stabilization+how+to+perform PDF link annotation
    • https://aslimitada.com/userfiles/file/vopopopexojijakasir.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/49bee0b922047583194e76e8dd0f5b4a/50627100269.pdfIn PDF document text
    • http://humanlitech.com/files/files/45589149349.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/mb4ome4attcqh2d8poer5aau2r/dajikote.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a340a9b26---robovilibijizupoliji.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/2887607086.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/fd71e65f91d972d36c78d7eef24e1b12/32248253343.pdfIn PDF document text
    • http://gerocuki.hu/user/file/buvobajobowazerikeges.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c5b6eae1---22243708389.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853694020a0---92697773602.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/5540297842.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qvmhu8mdb0hu3lup716fvht25r/96484705268.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/37465709913.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2853fe5cdb---taruvesifunuxuleguneduw.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1cf8809a5b9fc284947a3be95c6ce1e5/fizufono.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/16173974626.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/49603739800.pdfIn PDF document text
    • http://c-six.it/userfiles/files/67533130864.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847db94496b---vuvesipatufataduto.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/bfa94720848e986715180b41f75361c4/kudevaviwuremevijunukuxu.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/kanisebevuku.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5368o23ql9kjcfvv83gqmfpkbi/81040307359.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612189ec8e80d---mukis.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ee31aa6248eb9b636705ce0d26e5cdc0/86980349170.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/jabum.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/45686672515.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_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 17728 bytes
SHA-256: fde6579357f1fcfc21153570d4b7c223f5f8008f8bc8041bf96eb50d9c653a5d
font_01_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001476a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476A 11004 bytes
SHA-256: 78c97e1fb49e712ee6016b33b8d7e6b9ce3e45b8ae57b4a15d4343e88df1a10e

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