Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7ac2de4d331a64…

MALICIOUS

PDF

93.1 KB Created: 2021-06-26 06:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89231a48b21669da8348d85a5089a0e0 SHA-1: 88ce993084769e89630d9e44932e9650d6358fc7 SHA-256: 5a7ac2de4d331a6449448008ca715ed1668666fa55d7313826761c2b7b071d26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aduanaldelvalle.com/userfiles/file/wajanobajojamagizirogis.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075c00a7670a---jinuwedajozoremesuluj.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/53777074820.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/481e93c5720b65bd2fe466226353f3b3/92877276112.pdfIn PDF document text
    • http://strandedtattoo.net/file/dekosiwugeloposuxa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf57b9c172---xopuwajupivepog.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6781b3d49---geliviwabiwenasevegezurej.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40e2510d8---42704981044.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/27839304980.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e577a86ef---41919431271.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0492d0d1f---14350610117.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/tekejujabuxajoregewitax.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2uah5da9vq8on2q0a8vegd98a1/45224118237.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a948406555a---domegafolatitofi.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r83kbm6gm81129leiet4q33ff7/60457769915.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6871836e694e54b9dc6094e6b87e6531/jubexamutujabuja.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/vp4ast2rq2tgcauct9b1u9dgtn/jawuselulajejoget.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/48e97502b93b296175a4b4c63122e378/80641152391.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3a47888691e52bdb7ff6338372049021/bojutifol.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/87367587103.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jupetadifilavomavusa.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/simivejemabivevo.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/l42klqilqt28469j47a0596dqh/96901617285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=crossed+out+aPDF 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_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 16440 bytes
SHA-256: a67bc4242cd599d945ead9dcc7a7d52f26f54289e921ba2b46776dd70f539fd2
font_01_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 10128 bytes
SHA-256: 9c054a7c185584a3b06a507219bb2da18ea417f51eb9cdfc0417a866b6ebdbfe
font_02_sfnt_off00014f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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