Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d8e7d4abbecbef…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 01:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8753495391478a2a3e4c7a9f420856f7 SHA-1: 04077096f56d9278cbfbd437865d10c342e5dcec SHA-256: 91d8e7d4abbecbefb0cf3cbcf260260b6fa9e1c68419caa71f45a43245853f20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://ketchas.ru/uplcv?utm_term=iptv+full+play+2.0+apk PDF link annotation
    • http://ebiocell.com/uploadfile/file///2021090321455664.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/xoxenasogo.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/geluduginedituzo.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/7316476878.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/5641606127.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/48261347960.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/2043832243.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/diwepamuwasuvifuton.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613099926f947---modevuzimobalama.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/zomamikaxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f16f717e4---36417485389.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/23974419925.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/rogaganizodosotida.pdfIn PDF document text
    • https://hobbypet.cz/files/file/mixalikufoxoduv.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/40997348364.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/zitanubabojemefodojif.pdfIn PDF document text
    • http://mc-opony.pl/files/file/kezijabatezen.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b1dfd9d4b---nasafulupabibefewufuxi.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/pugarolerumulevesosa.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef64ca316---gevepulevovasavexiz.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/86597812645.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137daf3bc094---difarirolewonafot.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/nalanewi.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/38810826363.pdfIn PDF document text
    • 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_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 17748 bytes
SHA-256: fcc0b4588a7fea4b6452c91e8fa12869a214fbfedf67391d720afad22141e03b
font_01_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 10264 bytes
SHA-256: a2f30c75b6f05ddfdb410f9ee26742b404bb75dcf23dc8404ce5d5fb214b9e9b
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1