Malicious PDF — malware analysis report

Static analysis result for SHA-256 161375cdcbccace3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 05:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07b0516f3374e20666f06690e1d672ae SHA-1: 79ace9d1e64f4697d003bf2565808ff6a20c62d5 SHA-256: 161375cdcbccace3e6b9b243439c5d8da8777e17688d19d418eb38d27e9c2b9b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the presented links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d47aa2f1489632afcbe1351bb6613256/37500837736.pdf In PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/41129691181.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eba64669fc48da476059025d42e19f6d/76300809474.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210819231159.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ca4ee8f515a73941eff39855007b65cf/zegamejuraxadopadugodupar.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/wifivopege.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c8413274fa1ecbd35d16137feab8135f/25513297698.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088551d4b836---21274446369.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nirakila.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/35136330198.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cudjd16jg0kotk2ur0mb2s2n55/34883680505.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/tivulazapadozigar.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/gunago.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/52213648997.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/daminumuwaxerumokujus.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/pbtp1uftt2ncc6al33a3i7gv76/41940085237.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/midukusamawuxuziwuto.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/bupadezawemigemadaguxaja.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/luwutadevow.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/75611696776.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecb22ef45---bapabaduvuma.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/ruxuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+defining+decade+meg+jay+pdf+free+downloadPDF link annotation
    • 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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 19164 bytes
SHA-256: 9d915a6b95784e297e0632cad117b4b8f62a412a16f136bec3cc50287f8bc424
font_02_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 11096 bytes
SHA-256: 1fd3962f50599f30f3f52ea35e1d7f9d84f80b4a5177b679e90415dd9cb7febe