Malicious PDF — malware analysis report

Static analysis result for SHA-256 b002e6771ad9898f…

MALICIOUS

PDF

74.2 KB Created: 2021-06-23 19:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e1515a488ca6eb1a2214c3af25f3e9f6 SHA-1: 8edcd6b0d8fa515b8fd517bca64b580a0dc6aaa5 SHA-256: b002e6771ad9898f5fda6dbe19101a047272a679737457da6a4e3b8bffcb8404
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to job interview questions, likely intended to trick the user into downloading a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=what+to+say+when+an+interviewer+asks+your+weakness PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a187ca7a9---nibopopubigudalebakibepir.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160825510426fb---dezipov.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/53ct85vdj3ohj63t2bm0a3flv2/28638776985.pdfIn PDF document text
    • https://bataretak.com/img/files/file/81888267931.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c907f5586f---62786774833.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/remukululonuvegulisexi.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/11074f789118ba861601d0201b04cebf/25453987505.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/fovutizagoferunanuwof.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7faa7c370---ruzikitomubukagezodotu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/bobatexabi.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/15222648301.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607accbcd62e1---kukijol.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/56890108416.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/25dd791b8a32d6f038493bba405e5b05/47331576263.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 5072 bytes
SHA-256: d9b9928fa6a578ae666f22abcbab5dc2b7c371b88a6bc7f18086a9caab897a44
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 10596 bytes
SHA-256: 92e4187d056e0dd53dbeb5dee4a705a339e369b964eb90d2c7e063d56f3438aa

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