Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a96329ebb5d4cfc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 01:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 228ee4b0fab47f795bc04b596c1fd8f5 SHA-1: d5b19e315091466fdb5fe899b57f2765f54aaa24 SHA-256: 4a96329ebb5d4cfcd293c335206a1f318826955fc30c822f1ef53636f3aba9d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests an attempt to manipulate search engine results or distribute malicious content through a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://captaincook.hu/userfiles/file/79065381109.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2d1eb4a0b---bukawebukisag.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/44045920928.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/karawasakat.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/modumirifadebi.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/zilovivevojupexogo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381c63b2205---xuguxovirazife.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/62742968567.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090613124273499.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210903004854_2142569112.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/dabukebapufefuxomu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138c487a6e98---30288726901.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/86509143246.pdfIn PDF document text
    • https://akvaguru.hu/user/file/91977544443.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/modarumonobofisujude.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134138e202fd---82336089618.pdfIn PDF document text
    • https://terracell.info/images/file/fozadiverigimurajaxojizi.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/bitawaxuk.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/mopodar.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f5ac34853208363be9951548fa94e3d2/sewixitakozisi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f1a520b2---ledukowotabulelatagof.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/dorowivowofipu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/mofetagatifumudonosovij.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202193_41216_785.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5b91dd5f---43207692877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+techbigs+apkPDF link annotation
    • 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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 17880 bytes
SHA-256: e12c9a0334b7b75993c29357172e0bb8d162b44a3d4c25a36a2a5048e5af9bb4
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 10816 bytes
SHA-256: 7411c616c819d4db109adf7abd0501767b90e9a02afb9e549899116ccea959ab

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