Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7078fa0f773dc8…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 12:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b623441e3ddcac436a38f68de27cfc51 SHA-1: 58cdf4c9dad18c27ab34214c9f1fc0fa833c00b0 SHA-256: 8b7078fa0f773dc8a9fbce7b713849d879d520778a58cb5068e8d35620c018d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laurallo.com/ckfinder/userfiles/files/revugolifuvuxun.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3aa01f3b---6472798040.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796cf4a5173---32371312588.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210618161542_s3x7lu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8a1354b8---nonelazuwogit.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/fuvevesavaxuvoxiwagit.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/4345636435.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/089d8d43143a3e421b2d8ba7f02b06c6/nuxarepifidetovijijex.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/57387964038.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c212edf230d1f699de68aad2090caefd/28272649186.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641094dadf---44540897633.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/21b36f8d448a7c87e9cd2900ebae4b20/29602244399.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/70927dd3b085749a9f937bee0c8c9af4/66202825526.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ec7ba5d5---54974671301.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/60767529594.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071936571255---88813474821.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f13e7b08---92548189131.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/durojo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd031046cd5---vuwexep.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f74074e32---55018073960.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210516082819.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/073749220838e1126d19b5d07a168e66/dopulalovusutesetejoz.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/79728203527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=good+patent+examplesPDF 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://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_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 17196 bytes
SHA-256: a921ed17605f56de89b599e0bc1c554db6b684732eb28b164e733e7267fd2160
font_01_sfnt_off0001189b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 10504 bytes
SHA-256: f25a7f13b86d792c6e9f3e25013a383b359a40089570afbaaf6a3cc1575ebf32
font_02_sfnt_off00013091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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