Malicious PDF — malware analysis report

Static analysis result for SHA-256 9646ae117ea76f3a…

MALICIOUS

PDF

82.2 KB Created: 2021-08-20 01:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 24e47ea54867d18c5f6660e9d8384bd4 SHA-1: 65a2446f5fbcbe4237e490f70c531f94fefc5920 SHA-256: 9646ae117ea76f3a945296924575b326d0b60c06a873c43dd4fac557c1fe8131
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature, likely acting as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=%D0%BF%D0%BE%D0%B7%D0%B4%D1%80%D0%B0%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F+%D1%81+%D0%B4%D0%BD%D0%B5%D0%BC+%D1%80%D0%BE%D0%B6%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F+%D0%B2+%D0%BF%D1%80%D0%BE%D0%B7%D0%B5+%D0%BC%D1%83%D0%B6%D1%87%D0%B8%D0%BD%D0%B5+%D0%BD%D0%B0+%D0%B2%D1%8B PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6115e3854---30537712791.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/604f6e7044394591523b3f75f1d4f935/duxetavuperekojojako.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/76467867696.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/44412492596.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/17673059545.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5a2c2a759f54784a55c52617cae7de0c/20402266623.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2dbk8fma6uv49jcekpl0911d3h/60280607210.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1e03dad1e---vazebim.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/fazor.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/guxuroganimiluteve.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pidukox.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/16226147162.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/47772615317.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/76401579105.pdfIn PDF document text
    • http://santeh.md/img/files/69710044646.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/noxetevugujugomegexazuvo.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/lexonizujidupunesutokum.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/31187479400.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051020471379.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/24330014889.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/boregomawizor.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9d2739d54---gugadurozilopekiwor.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611126599fd55---92327935942.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/5014008794.pdfIn 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
    • 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_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 11188 bytes
SHA-256: c4d48afb6cc89000dac740398455e955f5b0894aad7c08620ae94536e4f5e0af
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 20612 bytes
SHA-256: 17cc029977e71dbb09dd0438574e106abd1082a620417be2bff1c425e82201e9

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