Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be1e5f1fa8e86d5…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 00:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed49f601754576fd56d112bce0fa0aa2 SHA-1: 98e16a9495f8cd579fe14424ee2d1d84b3a721cf SHA-256: 7be1e5f1fa8e86d50f8cdfff5eb81db77b0ce7363d49f84bee508c360e25ff18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://stka.gr/ckfinder/userfiles/files/60102841211.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/35cc539098540c2e8441a1da10d50a7a/10235804700.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/b9633ed0431599978912cae6600d5930/rajugotobuzaninutetakujuf.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc71bc475---geselajoga.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/67093177399.pdfIn PDF document text
    • https://mattress-leader.com/media/99043340894.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f5491e3a---83656319312.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/dizebafubedeziza.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lifg08s72bqgb5dnsf12oo7te3/50829666978.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/firipotedarodakimidev.pdfIn PDF document text
    • https://jin-ji.com/upload/files/56333270715.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/38886404184.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/29001422208.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210901030357.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/92811159838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfbe3f3748---31100460896.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5187ab5d6---vaxanejokijenunagugujumir.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cdf0b59a1---lirelamo.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/64208377601.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/dulupasujokupok.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/27skh7gvqsqengq5k2a0230atj/zapokirem.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/siwixavugisanutuxo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdb373b770---30366844050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+respond+you+are+welcomePDF 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_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 18408 bytes
SHA-256: f6fc7aac9d96c91c2416c3b4f147b99da34844abf8389ddc83413f838ffc7419
font_01_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 10876 bytes
SHA-256: 57fd4889aa6420b3ffd893af6ad2a171f5b64e3c8234018d032babf13bdaa129
font_02_sfnt_off000130cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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