Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8e5823ee72df63…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 18:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64c8848325d7832ccc016232a8575d3f SHA-1: 884928e10eee35364979ca212e79de70506cb7e8 SHA-256: ab8e5823ee72df63e8fd494daeb080b7c5a396fc065458cc8d0eb6cae868dce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and the link farm indicators suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=photography+books+for+beginners+pdf+download PDF link annotation
    • http://ahchala.com/img/file/48511126034.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/57830232671.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/27017006790.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/ctlqpejgkig922p2bab9uv3e8k/45093686217.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kimemuginazodosenizeg.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/89288247188.pdfIn PDF document text
    • http://lactopad.com/uploads/files/wapakapibu.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/godapudim.pdfIn PDF document text
    • https://mollis.rs//files/69796965006.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/923af29584ee119486628048bad5bd07/lefedajegidek.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/pelirepozobamegoti.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5e6b0c59d---64613600606.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/88504326292.pdfIn PDF document text
    • https://penal-garazh.ru/files/45677197468.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/dumebaseravum.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/27tse2549ju3lif281u2kr4p66/totuzade.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861897e96e2---22568860751.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/logivetel.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/29587141846.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609236769ad03---vozotolekuzexusexewom.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/safezakenesatula.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a350e3dabe6---93857490804.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160725fb70d593---23902927791.pdfIn PDF document text
    • 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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 11208 bytes
SHA-256: 0f28440a54dd641b96fba5556cbdf79d3883d923f7f08dcd9bd64ceac9dad439
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 18316 bytes
SHA-256: 6786ba6d99c6d6b2fccac2bbe6bae8b1bda393287d54e9004d6d277297673dbb

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