Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1993a7ff99c80d…

MALICIOUS

PDF

80.3 KB Created: 2021-07-01 12:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2f6f1b593e7f8a1c2cd01880b358650 SHA-1: 5d771eff71c73bef83ba1b4fa8736d829bbe1d5b SHA-256: ed1993a7ff99c80d14261f1af7c40926db0aff647fae047ebd8cac117f6897ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1466a2a4---famupusipejapopavuvugete.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a198866558a---59745070506.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/br5e043vte5l9dr35a2ib53ml3/sukibiwedu.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/62544737955.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6bb1670cc---wazifijuwamuzusolu.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/727e39e04adbcf63a7b4c211691a6dbc/mebopexewumugo.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9d0b9f61c5d52e7c18400ba1d5d25062/1959426850.pdf
    • http://oresteruggiero.com/userfiles/files/gutogokurupotogasovu.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e7200c919---dowazesutopukamozosetoj.pdf
    • http://banghetretruc.com/media/ftp/file/40838448951.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/40d088e2262a2b171813dd0dab205abe/mokifujidejokabuwo.pdf
    • https://aimhc.com/userfiles/file/41619393504.pdf
    • http://andlupa.com/userfiles/file/80945569694.pdf
    • http://steakclubhn.com/campannas/file/bosusevubupuguxo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e5seklrjp3ojmkq0oa884mgjc5/lorutuzetatopotokazar.pdf
    • http://sk-massimo.com/js/upload/files/33822713235.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o5j07unnoj4unqvnbas1phjgbf/61651669657.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609726d5df529---3186182154.pdf
    • https://smsenerji.com/resimler/files/48009282276.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2766e60f---belez.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/34492f6b45e08ce2e89f057f500b6732/tijovakiwiz.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2f751b2c---80054294626.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/welutuv.pdf
    • https://africanresearchcenter.com/userfiles/file/zimuvagijuxusisugopikoser.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=one+syllable+and+two+syllable+words
    • 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_off0000d5bf.bin
ad57135397df4e517fd3dfc5a09926cdb55121066665a6d75be4f0aa629175da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 10512 bytes
font_01_sfnt_off0000edf4.bin
d0220884f8e75da55bc71547e75a67ef49fda4204f65a1759a2b7bbc0c5c81d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 18420 bytes
font_02_sfnt_off00011bac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 16792 bytes