PDF malware analysis — malicious · f5f57e9cb73f54a2

MALICIOUS

PDF

90.1 KB Created: 2021-07-26 11:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4359143c0b27dd1e02cd55d7c81883cb SHA-1: 1ccf2bf0eecb84c8554c4cc1c97b57a300aa5309 SHA-256: f5f57e9cb73f54a2f6ad4eed6d28bc22d4e2bb1f8be7b578ecbc1a522fe2f95f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous compromised WordPress upload storage locations and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

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://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/pupirujamejimejos.pdf In PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c8cd1ea7---dijomikupegixekese.pdfIn PDF document text
- http://rexant.by/upload/editor/files/xexejeni.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9308592f4---gemal.pdfIn PDF document text
- https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e1ba486a008bc14bfccdad346e9fa303/xopajadezalataviwikepo.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ed793fd4cc1c44edd39f2e44f43927c4/1512131532.pdfIn PDF document text
- http://citra.cl/userfiles/file/zerixugavuralugi.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160850a8253916---63484894388.pdfIn PDF document text
- https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/bi2kuea27j2dejuau34fa64cf7/rokedexikedowubu.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8f723a8bc7556a663a67488b74f1bd75/29904578215.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3eef092a---regijelafexi.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875b2e08a07---24451935021.pdfIn PDF document text
- http://littlepearlbooks.in/data/eimages/file/wujazuwe.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ujfv77e8eikifdfkpn9d4pmg5s/defidasazumuroxedoxebi.pdfIn PDF document text
- https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/68c48b3f239dfacac23f3b5d088aaeea/23986440531.pdfIn PDF document text
- http://circuitoinsulargc.com/documentos/file/34383370561.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb144f05d---belofulawikapirawagulegox.pdfIn PDF document text
- http://ellev.fr/upload/files/zuteluwe.pdfIn PDF document text
- http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/sotimojuwufimisenerojenen.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94e050aaa---toxepad.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf992c1b8---rojavopa.pdfIn PDF document text
- http://indecomavo.pl/inc/dekabuziruxaxuwowetola.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96a3137c0d---64029446187.pdfIn PDF document text
- https://rajakedua.com/contents//files/wufinupikavalijewovow.pdfIn PDF document text
- https://manuscripthandler.com/userfiles/file/62943932011.pdfIn PDF document text
- http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/ralolav.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+behavioral+adaptations+of+a+lionPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fd5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD5F	17100 bytes
SHA-256: `9d2c20082c5b80340d3d4c6633e45e8ff686f79d131031867e9068b199fb0828`
`font_01_sfnt_off000129d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000141ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141EC	10796 bytes
SHA-256: `92764f97d5e2827dda92d06a657566d2b6fc2a87f3c9b18cfb95bf755dc386b0`

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