Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3eece0a2029070…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 08:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 558b1bf6f227bdf69bf5ab2db9a0b707 SHA-1: c39869776e6a5545706dbcbff5ed0a6f72fa8809 SHA-256: fb3eece0a202907092752679a05a1e90e49753da78bc45742c70e0fd0650899e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160caaa4e44f44---nuwedegekuwuleganavazes.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2a74c3a98---xodofusijimiresow.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6a893e411a620d833503a257ad855657/36412295745.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/vifibedekovatuz.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/60457090682.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/vaguzuxobuxirem.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/jivadatebof.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/49920500549.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xuxaxuzofugo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ec251960---kidomi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a027fc42b68---79906212159.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/2367489172.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/9r94349q26caussvc1j4f2gdcp/1784461374.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wiwobaxu.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/77819180889.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/38961613523.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/babobejepenevoj.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/zenogesemaxawupugux.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/odsi3du1crkuhj9c7gc8jjgtc3/15221784311.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/29903083095.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0b25fd2c970904ac1ad811096faa97fb/juwurubozofatavaw.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/vewotubikujovilutimewoso.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/dufas.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/67021303132.pdfIn PDF document text
    • http://krzeptowski.pl/file/82928088420.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/37369628513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=time+zones+2+student+book+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://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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 17656 bytes
SHA-256: fa9394d73b71b7bb20dd29992cf28481bacbac9229264e764e7504eb49114a6b
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 10828 bytes
SHA-256: 8477fcecc80a0ce3748bc7acbea7461093f6fb1dfb5df3a7405626120a05d79c

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