Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d97a37547de040…

MALICIOUS

PDF

70.5 KB Created: 2021-09-11 02:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c87b710784b1330c40557c7419c7c7d4 SHA-1: 262920c040a18908727bb1a7a30e5d46d8cd97db SHA-256: f8d97a37547de040a8190980f1048a5bbb6f2c59093be75e98a2f736b21c2f3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f873942fd---1588506040.pdf
    • https://sieuthimaycafe.vn/uploads/file/nobedapivazuxilowabet.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131710b6d666---98581643600.pdf
    • http://tv-kitchen.ru/files/files/vazilujojarubowavu.pdf
    • http://velomagazin.hu/UserFiles/file/25835784520.pdf
    • http://giteduguedesboires.com/userfiles/file/nofutisis.pdf
    • http://goldartline.ua/userfiles/file/149871534.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/9804444477.pdf
    • http://travelport.pl/userfiles/file/8751807653.pdf
    • http://evola.it/userfiles/files/20611041448.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613399a4e2a90---jusamuxemulavaguta.pdf
    • https://esvigo.com/upload/files/pesodilinivobutupi.pdf
    • http://csc-028.com/userfiles/file/20210906155122_os2yg2.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/rojexajizujojubagafura.pdf
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2393504863.pdf
    • https://qualitygums.com/userfiles/file/48135600387.pdf
    • http://meubelenindex.nl/images/uploads/12335845270.pdf
    • http://blgjad.com/upload/files/vigolaraxavok.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/gamomudobaxadelefafimovux.pdf
    • https://daulte.com/ckfinder/userfiles/files/kuzikagofawomulekodokosoz.pdf
    • http://spakimthi.com/upload/files/96325390292.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/80c7657a9ea1abc1e045a07688c95006/91863752020.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+uninstall+apps+on+samsung+galaxy+s3
    • 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_off0000b262.bin
8279784ee81f657c260db58d1f940b9e06dab8f49352f7bda154ca199d6bedbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 10928 bytes
font_01_sfnt_off0000cbbd.bin
88ed9b784d55a26dd0eaf42393b1a7599c5986a543894947776beeb552d661fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 15988 bytes
font_02_sfnt_off0000f463.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 16792 bytes