Malicious PDF — malware analysis report

Static analysis result for SHA-256 80464fae2da65933…

MALICIOUS

PDF

101.6 KB Created: 2021-07-06 23:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ab44e37c69dcceff9f7aaa743426058 SHA-1: fc91b5f9f5b6bc079c182c7a9b8a299f584cf51c SHA-256: 80464fae2da659333e6258b7015f98933535eb0e2fdc57c19b6175d96b768753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and embedded URLs point towards the exploitation of user interaction to visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47d1217a9---bisibubisegupopub.pdf In PDF document text
    • https://anmoul.com/userfiles/file/bokipikur.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5ac35677---rilelamevotanarapozugot.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cac171be8b88769b03d32a4cd5d5d0a/wibame.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/596cdfce096376243bea63c70400fde8/xagaroxavu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4970f2b212---30635103685.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/25262311539.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/5415716797.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/biriberepitazomuvifodi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4084b7c9b---84827612204.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/96uhsiokv6lt4o32ig8nno36n7/kanakugedizeviwujesedev.pdfIn PDF document text
    • http://iltorg.ru/upload/file/75382836425.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xuxagame.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5ddb62dd21e25edf7fbcf74fdf83c78c/64969283780.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/60750307298.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/2963438388.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e0e873e47---20104786172.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/munarulavuxasosijota.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/karasago.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ccfe7a7c---rukabilebejisedovaloje.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36aa003fb8---mefenavalazumilemumipoz.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/53919891840.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/6282088789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=grounds+for+sculpturePDF 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_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F7 17916 bytes
SHA-256: fd3313974b27776baa4cafa6263671c3bda9b2e715d98b5c2b07a4a6ed9dc858
font_02_sfnt_off00016fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBF 10496 bytes
SHA-256: c4b19e7894c113b9ec949f3ce34d2446c0afee38d7061a5842c3782ea7742ba9