Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e423a368eeea23…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 10:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d31c49c135b3436de27716855d0ca82c SHA-1: dd17e00097b787394aadfb0abec41dd222a00a5c SHA-256: f2e423a368eeea237ad2dc3e8153da06fc378c212496cbdb659ab3c8ca4396ff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier strongly suggests maliciousness. While no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs used to distribute malware or engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1inm9gierob4n3gksqg44v9cbr/manitafujivivifop.pdf
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/78242630029.pdf
    • http://signauction.net/userfiles/file/93533361842.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/43cd1dca46d74dbfb7b5ff539983eaba/juliruvinukanosuzajo.pdf
    • http://www.heksan.com.pl/file/zerono.pdf
    • http://ciskmv.com/css/file/97983558582.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607473b6afa04---39757461197.pdf
    • http://novastal.pl/userfiles/file/5351451934.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/sufin.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077893743749---95607158515.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb8e9eecc---tusekidojav.pdf
    • http://samromschool.com/UserFiles/file/gosoka.pdf
    • https://bruceautoservice.com/files/file/62635070882.pdf
    • http://mldinsaat.com/image/files/netugafezelefolafisa.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7f10d1f73bfc5058a73355aee355d3da/tafarudopevojudugejuf.pdf
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/28385720051.pdf
    • http://galluccifaibano.it/userfiles/file/10934954035.pdf
    • http://rigassprotes.lv/uploadz/file/motogizilotubumo.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747d65c90af---3214753303.pdf
    • https://sieuthimaytinhcu.vn/upload/files/46347062676.pdf
    • http://ubest.ru/images/file/27543920013.pdf
    • http://accronline.com/userfiles/file/bavigalugotedonujusulub.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9afc794adf---jepozoketorowojosikaxi.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/75751641163.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904160bbe7c---52366840218.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e67cf891650---xapagesimokesibaxirenuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=balanopostitis+en+ni%C3%B1os+tratamiento+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb16.bin
ef0309c00583373b51feb9b09d0187d6c65cebd8232006a0b61a616b27358a49
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 21140 bytes
font_01_sfnt_off00011faa.bin
1bf35979b119dc035d0ddf0e0718fd7b1795dce2c076b7d7cbe92e8398cbb2c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 10916 bytes
font_02_sfnt_off000138b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 16792 bytes