Malicious PDF — malware analysis report

Static analysis result for SHA-256 9404160a0cfa34bb…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 19:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ae9404853609d405a80dcda094a5204 SHA-1: 106cfde03614f0825465d89d7c83a3274741906b SHA-256: 9404160a0cfa34bb01a841eea1365a61600a490af125b6cc90a8364e3c8d9a05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. It also contains numerous external URIs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://huntic.ru/uplcv?utm_term=n64+emulator+pro+apk+download PDF link annotation
    • http://apmnir.ro/fckfiles/file/warafotokawarudusiri.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89669680195.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614626afbdb02---vukusibitagapugarubukoraw.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/vofusoxegivatewovugis.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109161949405603.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/36463536347.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/84178266044.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/xuretoxizajiridowijuf.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/besanamuxizaxezew.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/35915774035.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/98266183819.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/60715283910.pdfIn PDF document text
    • https://huanghecables.com/d/files/76826779124.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109060254336874.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/nelufutonujamejariredat.pdfIn PDF document text
    • http://0932018255.kad.tw/kads/ckfinder/userfiles/files/40399276739.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zoxobabogesuw.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/monapugezosip.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613163053beab---1562386965.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0b847247c78e6ba95a28f8551f72a130/18933243546.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/werowe.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/tomivelekunezojaze.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/60236343780.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/rakozobimoliwup.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/54491260466.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/nuzufetu.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/15705707385.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_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 10796 bytes
SHA-256: 04bcb377ab19691ccfa8c1c6764f60f6a92c307dabe2519c6a8a453aea8c69c4
font_01_sfnt_off0000cf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5B 17792 bytes
SHA-256: d8b35d13cccd6cf20a76370100871de4043d2c675141cda8f3a5eb3a97df269c
font_02_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1