Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa60de76d6fde8b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 06:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 232b7a80c327960f26aabc58e49368df SHA-1: 1e00885fe6ba87d3f32f4d1f1247c1d8f5b1dc1e SHA-256: efa60de76d6fde8b353e49153051380b7cd431ee8ee15065c6615565b7390ef2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or engage in phishing. The presence of multiple distinct hosts and the use of formcraft plugin uploads indicate a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a951dee17a---walenolipebekakifoxaf.pdf In PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/419aa30c3d86d98a6b710d1c4166a142/xudezefudur.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91b59bc06---38242192103.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/17589901012.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/91567288226.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f3c6578674d57edd203f0c9182a0a731/38584349152.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f9c183888---tirituwizusutixodolotaj.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/vasetojovimarisul.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/59695854753.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610993cd9f21a---46308380483.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hofoc16c0nlneh8cl2dennoh21/pakabagimatiwaxo.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/rukeg.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/71457068883.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/gevuzadumiwiwoz.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecdfd891b4---xewatu.pdfIn PDF document text
    • http://zerosquareonline.com/file/gabewafuzawaliboxemibuvaj.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/sukudujatubamorukusebebez.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///16827132349.pdfIn PDF document text
    • http://jarosi.hu/files/file/87082229197.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/38721304648.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160737dd7e8840---bimaxagube.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/denepitunofifokotexamazon.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/xepafadamojosa.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a99rmi2mo6tkg7l3umh8pgjd32/zinokegelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=conjunto+de+numeros+enteros+z+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_off0000c69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69F 18504 bytes
SHA-256: 225f88cda0b5256ee9748c1aac5d46e740febe7d48ae8aa28623a2a193ddad0b
font_01_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 10680 bytes
SHA-256: cfb03b281604611d12925d85140379ff6f498602b804675d2dd5b7f96dea3d8e
font_02_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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