Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ef50297b1925e0…

MALICIOUS

PDF

83.0 KB Created: 2021-08-05 00:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 350cf31cbba43efc41fc8e4aec9587e4 SHA-1: 9ebb13a4b114f9f6264ced487a2b1aa530662c54 SHA-256: e0ef50297b1925e02a1c97a6588c672963c4fa00c210ec44475c658db4c465c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised CMS upload directories. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to PDFs on compromised sites suggests an attempt to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a346f1b0c243387eb2658fd10aca979e/13109101507.pdf In PDF document text
    • http://tunglamgarden.com/images/fck/file/56826857261.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jo74lifkqdholq2ojamnh5qnht/fabagororulodenigumakof.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/buzamix.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t3dtgntrglhejg2q7bobicddpl/27536030047.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/mrijdkrc5c545c0sfkugo3c23c/sapobasuzojatamupegogep.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/rezasetemavarepudusule.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/7682631489.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/kilotazinatite.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6ca05fc702247331a5bdd25d120a7177/fonivapogasuvago.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/mafiv.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/78836378521.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfa3d3119---51839876294.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/vapogarenivonovisib.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e47e995c---59947485693.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/jakab.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62d534fc7e20e9a37d08812d7a124dfb/55871970022.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e13c702170cb305ce4a627c8dadad612/tiborikegokez.pdfIn PDF document text
    • https://parkettworld.com/upload/files/20734298694.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff967cc677---41797822633.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f7ddc979---fezatujimafawinurododuvi.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/afcdj0qd5g1k7a6114kqptlsaj/93069474223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ejercicios+agudas+llanas+y+esdrujulas+3+primaria+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://fichasalypt.blogspot.com/��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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 18152 bytes
SHA-256: 2e7ffb61d22dc88d65c25f48fcebea3207f0c2b56fb9e8a5534a534d12be368c
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_03_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 11364 bytes
SHA-256: 4488649d5f3e9db8836bd6c9e580b6d52a6808502ff2d20c88966f4c2c431e9b

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