Malicious PDF — malware analysis report

Static analysis result for SHA-256 3672b48bb133a60f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 21:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54854cd03200c838a3d6b2250a58835f SHA-1: 174c4a7eaf88eed2ff3a334021c5100e12b2b67a SHA-256: 3672b48bb133a60fda185a5b6bfe784793d386b215ac24723f6b3bfc12175ec9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a378474f02---fabozujakozoxesawonasino.pdf
    • https://youxsoft.com/uploads/files/pajumiti.pdf
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/wumepanozobufiwemaredawa.pdf
    • https://uzunlarpeynir.com/dursun/upload/files/ximagefajizuvokeb.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9877526cb---xameluniw.pdf
    • http://jorkurojus.com/userfiles/file/xebibuf.pdf
    • https://myphi.biz/nbloom/fckuploads/file/jezigufapunone.pdf
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/35354333438.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa03fe539a---49080421410.pdf
    • https://fontan-montag.ru/img/upload/7274102724.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/rozezutenatigak.pdf
    • http://baocaosuhoatoc.com/luutru/files/nitugizurime.pdf
    • http://wintec-samu.hu/uploads/files/wametelajek.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gewifijuwinenaz.pdf
    • https://getadoc.in/ckfinder/userfiles/files/jazurukebovezep.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/xorebazolag.pdf
    • http://dautuck.com/uploads/userfiles/file/gavigoguxagumezen.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/202319153.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b24bbce5---76354376908.pdf
    • http://sdds.be/userfiles/file/xanakojofarijijon.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/14668690270.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/66856758352.pdf
    • http://xlpe.net/Images_upload/files/pesogurimesexaz.pdf
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/pukezobo.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/lovasofurinukak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=epic+sports+apk+download+new+version
    • 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_off0000dc0d.bin
761e2323f7428000b29358a170c98de1f4121ad271c917167b0ea76afa427e02
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 17604 bytes
font_01_sfnt_off00010a02.bin
9b72e3e3a99507bbdc5357baa2dab8313db8138c44231c6b1737077c26498d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10736 bytes
font_02_sfnt_off000122e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 16792 bytes