Malicious PDF — malware analysis report

Static analysis result for SHA-256 096ff77651447ae8…

MALICIOUS

PDF

93.9 KB Created: 2021-06-26 02:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee26116ee03cbd085b5cb4bd8872f94b SHA-1: e0916f0f5489f878f31bfdadf9c798581a726a3d SHA-256: 096ff77651447ae80734d7401b626a11868fc22e568b5a90ff099441086f0ba5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ktmcollege.org/public_html/userfiles/file/pudugikabuxikefomu.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b73deed41---vidixero.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bae284589a0---17961893007.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/683363aab8d8ca12a19ede59f7d986ad/96248530148.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90deab1a3---selirodipefitegon.pdf
    • http://montaze.org/democms/userfiles/file/85700329422.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6da6617ea---refimemosexuxonixo.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c10e42d261f211118fef1cf8954aef82/libikakopidevunevewixev.pdf
    • http://agnieszkapawlik.com/userfiles/file/91500606943.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00905d39ecf1aa70eb408742f18b4288/tavanamumalomowesu.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5fc7f388eaf3bb0ee35551dabada7e2d/rutefawini.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf43c7697---75304060664.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/dvkjp62ohn0k4qal035c1a04j5/3544546369.pdf
    • https://oddluzanie.net/userfiles/file/jisofepilixomejefatapu.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d7nmore80pdslv651cdf6c8t71/40704029907.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f609a904b4---gimiwezelawitewe.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097dfed97d0c---vaxageleziwalobewajix.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b10a0b70---46361424711.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/desebuzonakefe.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/98104219245.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160807df0dcb41---fojejavevekemalogibuko.pdf
    • https://alakharia.com/public_html/userfiles/file/kujot.pdf
    • http://gazosilikatnn.ru/uploads/files/87706855799.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb61d65cf3---kobijulapozufisuros.pdf
    • http://apexnepaltravel.com/userfiles/file/nukafinowa.pdf
    • https://harkakotony.hu/UserFiles/file/romuxufobasijazakawu.pdf
    • https://mollis.rs//files/79512331749.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+nutty+professor+janet+jackson
    • 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_off00010744.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 16792 bytes
font_01_sfnt_off00011f56.bin
bde5adda1ca6056ca6819e5b0d572cb4a04b452ea26dbba268d1c124d8312c73
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 18856 bytes
font_02_sfnt_off000150de.bin
035fb5cc8dac70f21a5a1ee80ca7d2f67053943dd60796a906f45f0db995208c
pdf-font-stream PDF embedded font (sfnt) at offset 0x150DE 10840 bytes