Malicious PDF — malware analysis report

Static analysis result for SHA-256 54353e337bae3eee…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 23:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 506d0e884dccc6bd79237f9b318e7ae1 SHA-1: 0dba2946fc1344b516cdb03c6e9c1a5c90305b90 SHA-256: 54353e337bae3eee32b1d2ab186cb283258079f5f5707a9223fceac579983136
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oniceh.ru/uplcv?utm_term=research+cover+letter+sample PDF link annotation
    • http://alkanboya.com/files/file///61656024389.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd96f06054---73808312886.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/zefegeguzos.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/diboxotizatiraduvirevaso.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/25217921270.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085403b729d8---supuv.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/fsupamqm5drvik9rtuofgg33ng/78356174493.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/0a45ad8f36fc236fe8186abd58b423fe/girisoju.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/33272403919.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/diwowame.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ffaf26513---54761394641.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7l9c4vvb40e1jpuo2efgr0bgh1/68044501950.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/807fec5ea1618102cfbfa9c927babcee/57406731511.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/31857646380.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/dd984b45a4c9d677be26976ec3c88b33/21704618287.pdfIn PDF document text
    • https://coatielectronica.com/files/bubir.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/fumedefinuwexivor.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a6dd51a7---72037495686.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70727942e---batixofejuxoripuvokovi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210522235950959.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/5490135316.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/diloratijali.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/be87847fc14fdb00762e551dd2dd27ae/97013913603.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0824907f---xosiwogelibi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bncktml7ivh9se7s50c77d214j/wekezuzilela.pdfIn PDF document text
    • https://kawanmto.info/contents//files/51138333510.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098905e684ef---13822584471.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_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 10552 bytes
SHA-256: f7224219eb3fe8f9d6eb6fa8832c7dcd82178b28eaccb0b4a0f12aaa12a57a98
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 16916 bytes
SHA-256: 3ec3661144eb541638a5295c43b78ada40dcf39905a11c2833cf9f34b4c92a8a
font_02_sfnt_off00013b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1