Malicious PDF — malware analysis report

Static analysis result for SHA-256 408e560e7227b07f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 16:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 15a31d83edf81503f950eb317ca20527 SHA-1: 2f16f5e9d2818493b767505489c59b5fb2b688b9 SHA-256: 408e560e7227b07f7b6f574714b3be1fb149e32dff9ec371a9d1d10eb8662e17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://forma8.kz/ckfinder/userfiles/files/zuzekimipomidomi.pdf In PDF document text
    • https://mollis.rs/files/72475332873.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/2371496837.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/defilopatile.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133163a5c4e7---xezuxi.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/wibinijenuxofuvonejazitar.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/sewaletoz.pdfIn PDF document text
    • http://mdtrend.hu/files/file/sufanabipawuwutejo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467afd307b1---78291330207.pdfIn PDF document text
    • https://filetorme.com/upload/files/wamowuleforonalorasejur.pdfIn PDF document text
    • http://kant21.com/userData/board/file/9006592331.pdfIn PDF document text
    • http://edeins.com/userfiles/file/metivovokodimedumedi.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/61952534061.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/29896687504.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4d33b52bf5f1acc1b1a7927277a76837/14511100425.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mebaneturemolafedutamu.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/kotilobususukiwepowapu.pdfIn PDF document text
    • http://rococosofa.com/files/files/forarebeje.pdfIn PDF document text
    • http://rococosofa.com/files/files/xikivorufuximidixeba.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/33730499217.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/58921997661.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/48733902163.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/47257588809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=as+a+part+of+synonymPDF 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_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 10344 bytes
SHA-256: af8cef3f737035f17752db210af53aa265fc3c2d46e7da1c6cf33543f9fa1e7d
font_01_sfnt_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 18092 bytes
SHA-256: 39fd8a6bdcf1bad869eb0d1d6124c31765f210d291a3acbe4b7640f649ce3917
font_02_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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