Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a6e62e31b6f474…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 10:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c74cebb9c35ea6b3196ee5a3f1654b5b SHA-1: ca5867abc96cc07025ac2467b50794bf4c184bf8 SHA-256: 31a6e62e31b6f474c1044f283851bd4519b4e2420c6a3858bf17c07cb7b49b05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The PDF also functions as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains. These elements strongly suggest an intent to lure users to malicious websites, likely for phishing or malware distribution, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=cute+little+boy+sings+for+his+crush PDF link annotation
    • http://studiolegaletrotta.eu/userfiles/files/79640104189.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/pasagasefozikawikeseta.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fpmkjuo13rsbrhda02hae2v7ej/xoketubufevoxum.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/16418318870.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/20049057593.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mlmi9t7qinktongthqhga4i8us/66367627386.pdfIn PDF document text
    • http://mylodge-naoshima.com/bapiligorupisik.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iq3uv6023dm18qdqourph7tn50/35994452153.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778661afc2d---34801482800.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/879630c65d44b68b72adb1c6b1e5720c/womibaxaputunubigowudi.pdfIn PDF document text
    • http://hahapediatric.com/uploads/files/202108161705178211.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/27656473805.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/nawutaremetiragal.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7e4eb42f---lomorokitusufezit.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/93563426110.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/judukanizazakarajosiza.pdfIn PDF document text
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/bewuzozepenesela.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/nolekenejazudofabipobixu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5579b7029af66cc8cb4950411ab8536f/47971240359.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/mukojumisozuladuwa.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/dorekadisaduva.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/bojajoforakedafu.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d7e96bc3---23480871078.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_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 18648 bytes
SHA-256: 29c83efa7c698462a6ebe13c2ca8d3f839f47ac265828ed9a7d8a4073fb06f93
font_01_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 10840 bytes
SHA-256: 46c4ca57cdba6a6810c0b3b9006b1e4f04da5452130f9ff10a4193dfb8911e35
font_02_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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