Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b682d97dd3a6e33…

MALICIOUS

PDF

90.3 KB Created: 2021-08-10 06:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ef3719a479c368794c45c1c587ea30f SHA-1: 86f5454d5ac6f47cca961343e62b7d8ca0f34cee SHA-256: 8b682d97dd3a6e33a523842ff1617d431e0bdc2284a8687ec62613b38cbd2781
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 are part of a link farm hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=samsung+tu7000+65+wall+mount
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b4cbe007---28599531519.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/muguzebepuxo.pdf
    • http://alexlunacoach.com/img/editor/file/jafuminutuditek.pdf
    • https://qnzar.com/files/nuxir.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/80989d658b780520948c3f0e6455c3f0/xevinaxaje.pdf
    • http://haus-st-otmar.ch/userfiles/files/buvun.pdf
    • http://ithaca1962.com/clients/41687/File/jugigopexoxixugugemugajil.pdf
    • http://sevoir.hu/uploads/file/42421401639.pdf
    • http://aggengr.com/uploads/CMS/file/pogexifu.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608415a1145c7---18378580672.pdf
    • https://acrgroup.nl/userfiles/file/57825681852.pdf
    • http://tele-video.ru/upload/files/3918963440.pdf
    • http://otoozevran.com/resimler/files/savirokaxolusozupegiw.pdf
    • http://dogable.de/userfiles/file/96004660812.pdf
    • http://euro-ex.net/images/blog//file/jipazodekug.pdf
    • http://salon-urody-bellis.pl/images/file/81266288546.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097049a50b6a---pilemuxaweva.pdf
    • http://soflocops.net/clients/81266/File/zabijunuwamodumilatuwib.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e31d01def---zilegozifufadavakak.pdf
    • http://constantcontinuity.com/membership/data//files/ponaxarixevifidunoroju.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/23963590454.pdf
    • https://bursakaynak.net/userfiles/file/25979320882.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7932ec81---65433409063.pdf
    • http://bbfederico2.net/userfiles/file/fagekabulorimikiridil.pdf
    • http://bhk-aindling.com/userfiles/files/24529399055.pdf
    • 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_off0000fba9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 16792 bytes
font_01_sfnt_off000113bb.bin
fe1cdde62cc50da085b4e101665835f466558caefec7b8cabb58181433a4fa29
pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 17476 bytes
font_02_sfnt_off000141e5.bin
0aecad81cdb37156cb24100f7ae24aa836be115aceb3cb3636756b3bf821c76b
pdf-font-stream PDF embedded font (sfnt) at offset 0x141E5 10860 bytes