Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ef85fe2d126fb0…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 19:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 744f8d30df9bdffd422bf3a92175449e SHA-1: 8b5fd9e12a47af28850ffe386b6217bede6917b3 SHA-256: 94ef85fe2d126fb0cbfb4d0b8a98f2aa034b3a921f90e784a53204552a93c6de
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=visualizar+xml+en+pdf+online PDF link annotation
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed52b50e48---ridodowuneri.pdfIn PDF document text
    • http://ashioke.com/images/library/File/jamara.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/perazotigemunasanikew.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4l0shcb0li9jmrs7rdhcp9a9id/33467279847.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/64177471993.pdfIn PDF document text
    • https://dellrein.ru/content/file/faxukexebafugatadararale.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/jumoropeto.pdfIn PDF document text
    • http://szpk.hu/_user/file/46962204041.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/snhmgf976akqoobgukib52a1no/54261969272.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/lididunubamonumi.pdfIn PDF document text
    • http://it-hair.com/userfiles/fonitabezovavuxofususi.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0177149d72c1663926ecc5f8f7636adc/fetemu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fawisarema.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/wugudo.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/23955603404.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/48b6fed3cffab64257c1ad35d4952e25/81245269204.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/dvvp2lg1rtcrt9p1k4k7nnsg35/pejagimudosufi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/91d8ff161770fb7416f0932dafdead5f/5853931765.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_off0000c98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 17736 bytes
SHA-256: 9471f0fe5c072efd5ac7caf9f98a30bf3db5315bbb0c68ae0b2dd632b2b6c15b
font_02_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 10792 bytes
SHA-256: d91f03bba43c8988ba76105488452016c0b286e5fb3a8e1e81843f6dc1fc7212