Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ce484fe8271409…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 01:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b812ea3db1d5b5a046a44fa57a4fd67a SHA-1: 61bb0f0b0443c482bc17ec1d49abb6d590b49040 SHA-256: 14ce484fe8271409762e42c3f79e795628e43a4027ad22ef00fd1119fe43ca97
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to direct users to potentially harmful external resources, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=live+tv+streaming+sites PDF link annotation
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141bcaed8802---30421728156.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/32205216673.pdfIn PDF document text
    • http://bdn10.cz/files/file/tujugewaji.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/63232181532.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/22506398590.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/92277604564.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/rimunuresubowofofowe.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/92395007861.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/15592647471.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/49623328216.pdfIn PDF document text
    • http://mrybalko.ru/files/11604543477.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/mogod.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/31857645289.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/rixamiji.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/ralibiwatatupunun.pdfIn PDF document text
    • https://network-italia.it/file/jofisaraloparexivu.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/negepi.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/wegoneguzuve.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bbbcbeff4---bufukawaxinozidotafub.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/50284078996.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92c25a7fa---norojixujexonadiw.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/51711982702.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/xopezolosireboso.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/69596308641.pdfIn PDF document text
    • http://ombs.ru/uploads/files/jaboxokitudipegus.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_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 10308 bytes
SHA-256: 5947bcf7e93b4a352738708a5b82813fc32ee0a1c9d3ce44d55fbc7e25120c3a
font_01_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 18532 bytes
SHA-256: 70464ee0f0e157db5b5612e9803a01d644164404bbbfef06e0a8c19d298bc68f
font_02_sfnt_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1