Malicious PDF — malware analysis report

Static analysis result for SHA-256 4457e9754ff0a504…

MALICIOUS

PDF

88.7 KB Created: 2021-08-17 21:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 81397c9ad978e921a6241ddbc66661e6 SHA-1: 3c2bfb8bd7250e68363e00f6aba9cc1a803edcf0 SHA-256: 4457e9754ff0a504c14e8487ab99d22c2c3cf5d6ddc3edddeaa338d2c9ed5339
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is often used to redirect users to malicious websites. Heuristics indicate the PDF hosts a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://omegapizza.net/uploads/files/68974944162.pdf In PDF document text
    • http://dush-kz.ru/uploads/fck/file/25257656755.pdfIn PDF document text
    • http://www.celso.org/download/jowukadotomitananajajajo.pdfIn PDF document text
    • https://dptech.vn/uploads/files/37016472004.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26545c2a90---38636263842.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607417268e543---954547998.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/81141222805.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f29b3775d89e89dcd396e2b2383792b4/nomulitetozaza.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/32169652987.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/47498572615.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/63790376184.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108150253039413.pdfIn PDF document text
    • https://drsaman.com/files/32499086158.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160957aac84711---kokeremafag.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/japuvawizipi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/felumoku.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7e4653d0aaf0e1c4d6809a36c87d4322/xijogajalojizi.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f13e00afce4059604221cb7b0b1c0c97/pigobezidaneka.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/dijukarujizazivuxikok.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/zopidobavuxomusezobu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aece570363---dizabani.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f0937d3c3876cdec003cc3646f002e32/22445597368.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/94060009501.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/lagaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ubuntu+create+bootable+usb+from+iso+filePDF 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_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 10744 bytes
SHA-256: 9549fcb6211f5b45b7cff9763148a25d093262b03cc2b849f608d80b8134bd18
font_01_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 17088 bytes
SHA-256: 95b5663472d9f103d710a6dbcc25dc1d79c2ffc4edb413aae2fae8209ad62f03
font_02_sfnt_off00013c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1