Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78a593d43e90293…

MALICIOUS

PDF

88.5 KB Created: 2021-06-17 12:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 772d49bdaf7910eac75fc753bab3bec8 SHA-1: 3515b22f108db06fb7277e307a2a0d16a35e92d1 SHA-256: e78a593d43e90293d04bbcd73ee6255f913d771424dc10332d0128efad297af6
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/uplcv?utm_term=maths+lab+manual+class+12+pdf+with+solution PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd5edbf1b---86678851054.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/xifiduwonafovizul.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/tikatijifeze.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c50da6cec---gunezuwuwepu.pdfIn PDF document text
    • http://adveotec.com/img/file/wubelemedawugasujateka.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/815692669.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/47a71c56e194e5691f2aaae5b7419d94/vapiweloz.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/savamevegesa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2e369297---71378317523.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2561a73e---wedemufuz.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ceb6f07b9---podefodavudovapizegiwe.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/rujaji.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/odp6s4rktocn48s24ssuh8cpsg/tiniwatine.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/66496047374.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0rqi1h1s8nfh9esqpln5lqfk25/nafixafadodakewezaf.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28213b1240---taxalakafufewudipolafatoz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0ea0d18d---timixuzebagagabanufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 6548 bytes
SHA-256: 59f3fcb9194858d82687c8059c26a10d1a2c57d97279b4f70ce13c0b395e91ed
font_01_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 5720 bytes
SHA-256: 4190bb6666420ef23e4be729dd4022cd8df17b5656827e55d3dd90ae6d970e13
font_02_sfnt_off00012c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C56 11304 bytes
SHA-256: 9d5d22b722a3912a15e71671263fff7d067ef275cf2937bff8c17c0fcf64f4dc

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