Malicious PDF — malware analysis report

Static analysis result for SHA-256 66991931aa8d2551…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 07:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1abedbf2a13347db6ad9128d3e9ac367 SHA-1: 185dd815bba5078b993b98bad84caaef63efd8b0 SHA-256: 66991931aa8d2551afee7d56318ce584ab4c273bc6fe44d18787cb1474f5abdf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://insinkerator.us/images/uploaded/file/nopotofomojen.pdf In PDF document text
    • http://italianopizzeria-pg.com/uploads/files/49092846788.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tepinaruloxijonomagiwarik.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/megebiburivuvina.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/85f0be914371c13da6b92f7b1c89d96c/lamenima.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/68926127591.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/33910353965.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8771009ff---39420425837.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/wibek.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/17229298175.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/18792409969.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d1f3ff4edf4624ef83f8d383d58a3708/nejuxosilowewox.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/wubib.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/45283712956.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/lutilanux.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/wopujijugivofutuv.pdfIn PDF document text
    • https://epiphanych.com/images/file/xakixap.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/5558917849.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/tibamexurimesuvupafidopa.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/puvojip.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/91523031377.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gobinafatezikol.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fiwogure.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6116289835.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613266b334f54---guzagumokevizafunijakupes.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902042346282118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=logan+vs+floyd+free+streamPDF 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_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 10740 bytes
SHA-256: 6fda5f68013be649a588405bfae02ec3f8a6f7990773137e30c6cad4a64b93fb
font_01_sfnt_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 18248 bytes
SHA-256: 7303cb88d2e453d8ee93a12cda66fd7122bbbbdbd2d218f3af0a60e621e66da5
font_02_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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