Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd96a485c5e1ed94…

MALICIOUS

PDF

67.8 KB Created: 2021-06-23 07:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eef10ba6b8048e9b1634b3d513ca0ff4 SHA-1: 7dda43b8221b0ae58ec53d25f5fb86700017accf SHA-256: cd96a485c5e1ed9488d928b198cae5b750467ac25daa6c6b9f7a3523326ba17c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and utilize form upload plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though obfuscated, suggests a lure related to 'positive and negative integers worksheets pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/255afa8b6994f7166dfe395142d99ff9/wajatixuxadebod.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a97a08122bbb641c6aac735974684b5a/3674196978.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/62912e4c9cf60e087d295c36d435a751/66956654932.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/dbf88a8eeec4e0fde81396f36defcc3e/filazixafomowoverenufo.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607178a41bc82---jimafupiva.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3511baad---xuberuxuxagovesovelevof.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5523b4b0ca---82974736251.pdf
    • http://doo-san.com/userfiles/file/20210522114103.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sexunamimufemiwopat.pdf
    • http://www.puhito.hu/uploads/75646651420.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/54936b6765782ed9a5fab0eacf542f19/16162856732.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/41279266e7dd6aebac110089c9bf41b3/vegebotigulajebafusapape.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/gubomupo.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/xupuva.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bce8a01de83---41731791717.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f64bc6eed869aad885671ec3f6dd1fe1/25107536101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=positive+and+negative+integers+worksheets+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca9d.bin
00a21a0289735c8f061de9645f8b922e32965c62d5dd5595dd624c928a434601		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 5488 bytes
font_01_sfnt_off0000dd61.bin
d7760d44416fbdc9bcc86f2c39f373d641cecf1d3018ef26e7bbbd8f44c774de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 10744 bytes

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