Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dedfbeb57f4bdad…

MALICIOUS

PDF

81.0 KB Created: 2021-07-21 13:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8fc2664d0498150a82ad60ef231dc4c7 SHA-1: b5d7f7def067b915179a7db036ba945a41a6fe39 SHA-256: 8dedfbeb57f4bdadc0a721aa5a3350b3a0320a29ae331f3b32a53cfb7fa9550b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://produktybhp.pl/pliki_user/File/ninefola.pdf In PDF document text
    • http://zulassung4you.de/bilder/file/dedebizidimotepovesuluj.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/77769740145.pdfIn PDF document text
    • http://leguido.net/files/nulexexonavizirutikuniriw.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ca40ea1b---49986041968.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210703204325_0bcvpr.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8eef7290dab5943de8cb6a554037655e/garanasokokamodexino.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/hmr962vjb5v9dqbq4temj9ovlh/mufadiponiwuxas.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef6d59710---vivizixipodeluze.pdfIn PDF document text
    • http://htwy.com/upload/file/58681087382.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/puelitkmjc05tocvldgaj3qce0/40164366100.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/poxusufow.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ecb71dd9b8011ff62aa75022678615eb/dadugulaxexup.pdfIn PDF document text
    • http://artasedanasingaraja.com/uploadfck/file/sukiwavosuzigoret.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/9dc0df96c216709590c4890502c8a67a/rugabeguxilelejojipana.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/napiviz.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82272184846.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2tlg0vgi4lb184cg40i54msb18/tibadegitomidanafibelad.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/94155618965.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/nufoko.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/3631108186.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/75796655124.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/majajov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=realistic+texture+pack+1.12+2PDF 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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 10720 bytes
SHA-256: 2134ab8aea286cf5e8df682786dccf9a2142c9b58eaab59d86998dc5e7b7c2ed
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 16392 bytes
SHA-256: e1ada323c40b3109ab9aec1986282dc01200d7306612f1ce1441d1ee64d2b69b
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1