Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ef11560c333ed7…

MALICIOUS

PDF

87.1 KB Created: 2021-08-02 08:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd7b6d28438b2cca79a720d2f670aba2 SHA-1: 21b462a1820ccaf55c8e60fe76269fe9afcae6dd SHA-256: 63ef11560c333ed74832ec051e50a8d185e3bf15a87b24b19003babfd1f2e4cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://audit-advisers.com/userfiles/file/58057025736.pdf In PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3d1a3677b12c4b2edf960ca689fa37e6/61134240507.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/26567649977.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7skilape9ielm6bvs51o64hdm1/zugawajagorozewudiwewoda.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/pinikarabodefiserurifop.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608244487cc0c---68457514361.pdfIn PDF document text
    • http://jar-ted.pl/file/ralenimizuleredozil.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/zepugojotiw.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jitupokebibiloruw.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/73606355343.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/39204182774.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/69444537705.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d921e83931cad70b065cf2f1ccdcd995/tapeximupelome.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80712866a0---20589359635.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/46871381596.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba865f0e7b2---liligijisejediwamadu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f63cdee53b74b1da44062475f20f02f3/bajitonewivituwomexepe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/79bc63bb001369ec009cc7f975287aa6/fegefisijisalidinoredekov.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/79515963553.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/38447529749.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4a24930c47728516492cd067c01d13d3/ligube.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918b704ce7b---35274255787.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/52974260410.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c661da13d45f8f8ef470e0769f886e8b/25621818233.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/wosot.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/79692739038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=predicting+the+products+of+chemical+reactions+worksheet+pdfPDF 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_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 11348 bytes
SHA-256: c19890751d042de380dbca9f262d5a050030478709e3f56badb946165ad2b5c5
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 15992 bytes
SHA-256: 5bda9a9795045a50eb535616c7911aa4800b7397719da02d0d9a3433ea2f13c8