Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dcfcc95d18ae52…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 07:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 968af5d0b0b34dc77043fdb9af908944 SHA-1: fb0412a0f6220749b88d71cdc70030f670316fd0 SHA-256: 91dcfcc95d18ae5201bb76c089db36a3a8e6348fce559005e9fa2559dda65b7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/10449800088.pdf
    • http://ztkammer.at/uploads/file/33801727770.pdf
    • http://ipost.mn/ckfinder/userfiles/files/32171476541.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/eo99hnbbub920vaa6b5qgkojma/91955326819.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087652d9e734---6729883303.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/19069333653.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612ccf2caa---kivupurabak.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e04b2efcbe---vinolorifuturemep.pdf
    • http://sincaremedicaltour.com/js/upload/4109151274.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e2fb9592---61921194925.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/155a2dfe3df7e876b0f55b65e03cf22b/22791101154.pdf
    • http://n2nlah.org/UserFiles/file/velojemupasozipedafur.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48a9422f40---gekumigogerikuwizifuv.pdf
    • http://chonburi33.com/userfiles/file/mamezemufa.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/riwixawizofalewulasuzizi.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5177aa4340---vojugidujelegatijopekupo.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ad507b15---16551194972.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-8/20210508131406968186.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/39582928549.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fad5db1663b02df46acb7eb394711102/95784312414.pdf
    • http://tokyoto.pl/UserFiles/file/61350596310.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abd840a3dc6---68364350089.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb5eaf973---22417134782.pdf
    • http://bocghedanang.com/media/ftp/file/woropatumojavu.pdf
    • https://karinbentum.nl/uploads/file/nivemelizev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=combine+2+pdf+page+into+1
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73f.bin
5c5efee49d3c6a187ca35dd246065458c9c04f6c09fb8d52eae87803ae6060a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 17868 bytes
font_01_sfnt_off00011601.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 16792 bytes
font_02_sfnt_off00012e18.bin
1aa3b8e27452c5a9c76ec3ef91367a04ad3888ee855149e76766f8d09a8ec662
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 10868 bytes