Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c7670d96592cbb…

MALICIOUS

PDF

74.2 KB Created: 2021-07-13 15:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2cfba3396133e5d09b381cacb3b2e636 SHA-1: 1f56d1bae789810f3841963663d88a70e1f9003b SHA-256: d5c7670d96592cbbd57c3bb8c54cc1b4e149edea2e45bc90c302f0efa0bf8f17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and using UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=square+cubes+and+roots+worksheet PDF link annotation
    • http://tremonttemplemacon.com/clients/862779/File/jidejaloge.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6f1b4f99---32102910927.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160838aa606910---30234001247.pdfIn PDF document text
    • http://www.heksan.com.pl/file/sisodujojob.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/mimopalizujimiwo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28c189d71---nesala.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e325a39ddc1---11256564280.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/5349c5ba0cde385cd329aaa1eec8217e/82192142273.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/48427078206.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afee3f59541---minarobesupesul.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/89e7534134824c896d90f6c244c6d00a/96070521364.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/106b92dc318c99ef253b014fb03148d4/36934808949.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/057de41209d86264e270940a4482c07a/61720313717.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c9e0cab77---78723866037.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ca0b6e7d7384d3d621297eeaf44417b5/pebelotovewifuvozixokin.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098e52bb9ffe---fotipipovunokatopifimor.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/skv88l9rej0ti204egf9lgmlgv/tukilifeb.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f2f08213a6b66f06f47d0b907f31aa75/38233966571.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/71352462103.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6524148859b633245a8d5cc3dde6d47b/53549493107.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/16710193571.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1hmu2girb6dkbo5d2p791friku/xexipibigagupojizizulutuf.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/botemasetirikuwotavedo.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_off0000c043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC043 16216 bytes
SHA-256: d3da1f88467cf83c7d70dd74ed76a68c7ddf8843711297bf6f1431514f03ed70
font_01_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 10968 bytes
SHA-256: 51df71e1ab0285f990c4887903b50e0599a5f67cb47456756145ebcee89bdc0d
font_02_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.