Malicious PDF — malware analysis report

Static analysis result for SHA-256 121964ff5bd9fe8e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 16:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 926bf7e61d2d83ec6b9a82a01c24a3ea SHA-1: ef25ae5019863fe933906b01fc9ce04ef9c8706a SHA-256: 121964ff5bd9fe8ef93a442f1d2634df9278df9edd128c3bca25a7d62e53e6bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and the 'SE_SECRET_RECOVERY_LURE' heuristic strongly indicate malicious intent. The document's purpose appears to be social engineering, tricking users into revealing sensitive information like recovery phrases or private keys. Numerous URLs are present, many hosted on compromised or disposable domains, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://allytemp.ru/uplcv?utm_term=gimp+user+manual+pdf+download PDF link annotation
    • http://land89.com/ckupload/files/4580572270.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/99269933988.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/lbssurqgmvu782510ermlhs5c6/27388577639.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/65663581867.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/81282673252.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/nilazinud.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/rodikedimew.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/rigisepewefow.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921915306484.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/gugumovofozexekin.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/ribivegemot.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/vidaka.pdfIn PDF document text
    • http://mega.kz/media/upload/files/mifobenaniwevafisexu.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/70076530047.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/egvh25ivv6aithtu4u61t1uup4/xirunusobufudo.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/wavadeg.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/edabdeb369ab5f5f84313a2ababbf0f6/surukovagemidavatibironet.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/mutadubemivogopegegerudu.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/dotupegewuxe.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/vazukuselotalejulenev.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132c1b19e88b---nosemuzo.pdfIn PDF document text
    • http://aimic.com/userfiles/file/jeserebuko.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/givatodupaketowa.pdfIn PDF document text
    • http://z500.si/files/fokikubikim.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_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 10784 bytes
SHA-256: fee986c625e2d0606fd4eb39ebd9df1c26bdedd6e6d849e537b5f2298c481e66
font_02_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 18008 bytes
SHA-256: 22717e2f8ddab71a0eb432b7ca100ffbf14fcaa50334b461846fc9fc3a820d5f