Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c470f7af7d1f6e…

MALICIOUS

PDF

85.8 KB Created: 2021-07-01 16:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46a74b859a077d3300646bb26ef8c67d SHA-1: bdc3f98bb6ebc240b87a382b85d2657b52b5a657 SHA-256: e5c470f7af7d1f6efeff97695cbaffbafa4eab85ea7b1d86c87b3bb6340bf5df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and numerous external links are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607260f5bcb54---98316645102.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/55hnn9n2cmq7sqi0cbhkuntevn/zakizageverak.pdfIn PDF document text
    • http://cke.hk/userfiles/93829360094.pdfIn PDF document text
    • https://shidoremicrosys.com/media/rawirorasanebofa.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/nazori.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/58552746866.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/40364478450.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gojowagediku.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/30159018797.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/88013260951.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/44981674215.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bb536ec16---37002488740.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/jep5fu7i3h05clmcdopip3gm80/89794386316.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/38164721458.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27e940764---5146766515.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608249a490e3b---topasevezetefizexurezagu.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d1c13accbff52b2484878206343f2e67/45567692008.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608145a58de38---13112185437.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/bovejejuxuwumubufe.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g5p3c51iktslakpkjspt46ghh9/zabadadunumofekosogajuvu.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/h7t3ucvtco2nc44dunpljeghe5/rokasesinojofufiputamuj.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abf671397c6---lonasijunonowaluja.pdfIn PDF document text
    • http://asustainable.com/global/file/posapokowadikimopuzemasa.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d0e1b261---53399100715.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/zudisejakepejijumelin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=old+folklore+storiesPDF 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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 17644 bytes
SHA-256: 20cb0bd297e87efd1cc807446c7bb156151107ab70046e9ad24e9385bb817571
font_01_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 10196 bytes
SHA-256: c2dbabd457f511366b3838ee8efa18fa56268f07bfa7d3b4e5c671c74983c00e
font_02_sfnt_off000131bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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