Malicious PDF — malware analysis report

Static analysis result for SHA-256 8714360e41b9adf0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 17:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb31dae38d395c7fb04225f08514e480 SHA-1: 940cd64e459441f73686daa2c4e40ca3981b32e5 SHA-256: 8714360e41b9adf03e4e4f0fc2d7546fb61cfd2a44b1f9c3e1b6aab3c895c1e5
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=nocturne+in+e+flat+major+pdf PDF link annotation
    • http://pierrevillers.fr/mairie_files/file/62326402965.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/xezunekifabajigumozejor.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1238a249---7710584716.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/kebetumepifurog.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2d32c5bb1e7ea2c9c8a57f3000c38039/34765102532.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/sujavufavovotisozavan.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/jekobot.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a4e51645---pepulowinuxezukumeleler.pdfIn PDF document text
    • http://vln.nl/files/file/52204801222.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/jifadopapijoparunupox.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec71354fbf---33022024949.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb1397aa8---67764531645.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/lavososamozakuzusow.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1ca595574b97de97eb6db178b87b185a/jojikipolane.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090213004973499.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/11062431369.pdfIn PDF document text
    • https://arerp.kr/data/file///20740817799.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69150276039.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/74908544032.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/38120698701.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d428f00a9---fimumuzafivadagukemu.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/kipaluwewuparovobovimuz.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/rupiramidu.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/vodovunerodolud.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/dimunir.pdfIn PDF document text
    • https://moolans.com/uploads/files/21812688484.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c936bd1ee9---38899890995.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0d0c03d3121388d21584bced7e60f52a/dufomakole.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_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 10820 bytes
SHA-256: 9ed2456d005387095fac343ed190a0b4088fe1e01de29716a7a587a68a31af33
font_02_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 19224 bytes
SHA-256: 35622db183e3d6368f1673688602d6c17c35d9dec8efeef860b6917ae8b8a197

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