Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7cc4003d647a17…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 04:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b4df3b11f5e99986e78539fac48762c SHA-1: be9cf4cbb5084f2356699547470cafc1fb64513d SHA-256: 4b7cc4003d647a17b7749b145da7282ee8b9c10d39c394902e600be39372a7ac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6393dfac---lopuwidalatubesolakoja.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://plenerowe.kbo.pl/ckfinder/userfiles/files/gaxokubiligomomeponez.pdf In PDF document text
    • http://master-br.ru/img/file/48837070057.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/werisomupeju.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jetudatutopunusuv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6393dfac---lopuwidalatubesolakoja.pdfIn PDF document text
    • https://parc-hotel.info/file/masobomug.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e394efeb3---womimiwinetotap.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/tedirosezatujugusogap.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/44676407896.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161335da0c99fb---topofenogumesewetab.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/litupaxupomoxiwozokira.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/roberojogejotilaji.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/rugexavizin.pdfIn PDF document text
    • https://tigapilar.com/upload/files/lemokodoxitizalajugatesew.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34ccfd78bdd76ebcad008d2715879c9d/bobab.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/61209349847.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c91334fe5111af010eac3f55d6571484/wiluloziloner.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/27508714963.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210909050045.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/36147668097.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/53261454678.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/cd89aa19032bde496995c622a58ad074/fojijibofejolidegafum.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/75090271422.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/97320412800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=xbox+free+skin+fortnitePDF 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_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 18048 bytes
SHA-256: 17808f27253012cf4f66eef39f0f4e83aaca7bcf2c44e0471922cf84ce0fe0df
font_01_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 10340 bytes
SHA-256: 297d38d92796f68134492bda48eecb79dcb61cb26cb3b8843328f78c0d90710d
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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