Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae874120dd48eda…

MALICIOUS

PDF

90.5 KB Created: 2021-07-16 21:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9f5de41a211f70094eb926d8167d66e SHA-1: d50a40a99a1279d7d9f1c2bb1b55504c770602e8 SHA-256: dae874120dd48eda6b832d793338f19b4c63866c23839f482a7984a129bf30ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904cdbdd45c---vudadibifo.pdf In PDF document text
    • https://go2germany.ru/files/file/gebejodabu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a8905b77222---waverojulenu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872613ea254---34411662298.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/tufap.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/95158965245.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nowetubobaxuxibo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094a53f7c3b4---kekatakemisokarok.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/berutisusugesogusakege.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e891044e6---warewobonovudosurapudir.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/05bf8aa145ec8933a02029a2e595caf6/nugizuxifizunarubuk.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0df083ad6a2cf5b38ba8edc5b21eb41b/37445413268.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/59139100671.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5df6abc6f9---wudenofufoxuresikaxavosaw.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/11238156844.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e8794d9e---vawekuzibidumogej.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/14505237949.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/nilefexesegeno.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607772ca859a1---boranewobetopivef.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d79d9e3e---majanometu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/xovenifodekapofaza.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e99453e101ec51a915ecb983cda78fe6/57648193804.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/situkanimamugaji.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/megujixevirifet.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c258e5ee02a---6765053445.pdfIn PDF document text
    • http://nineslash.com/user_file/file/tewemej.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/matulejosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reality+high+movie+watch+online+freePDF 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_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 10924 bytes
SHA-256: 5b1ac6362b3eb1851968a95c295b4e87623aa7076247934bf58e952d70d0933f
font_01_sfnt_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 16932 bytes
SHA-256: 06f274ef6d92ed282e32fb8664db6616fa93a99aec8b77ce6aa40e031009226c
font_02_sfnt_off000142c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1