Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b32b32943c1b3f1…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 19:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 12084fd8c6e6dfe8608de227549f2ec0 SHA-1: 0662265133cc4cee8506321fe7562abfa8599a24 SHA-256: 5b32b32943c1b3f1683ca4dc48552ccf5c47da4a0f5854cb013fbd88153a0a66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely serves to redirect users to various external URLs, many of which are hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a link farm and the nature of the URLs point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sjatupornservices.com/file_media/file_image/file/67060472891.pdf In PDF document text
    • https://contabil-fiscal.ro/mm/file/miwowilidomutugoj.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/boforukajem.pdfIn PDF document text
    • http://pmke.cz/pictures/files/10471567707.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/kunezoxifen.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/josirulurarigeveginepe.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/vuxibo.pdfIn PDF document text
    • http://asustainable.com/global/file/33967379374.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/dipowuwilen.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252fc24e87---foruzodipababokenolud.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/27789468013.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/36182402884.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/68638090883.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/71306f1c6d9c78f02833372121415789/58636142381.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/16503603957.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/11769316553.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/70337807590.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/26812153957.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9de15127---21868690556.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/bozuxiwupulonogotiwu.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/35601125673.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/98750634546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+on+pdf+documentsPDF 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_off0000b054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 10820 bytes
SHA-256: 4d4ecadf1737053f4761a2080620c30631daa63c5feef8cc6639b965266ca832
font_02_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 17208 bytes
SHA-256: 4d7adb4f21368b8da2cc6b0ddcd88e2c9c540c315046a58e747cf8515f2c7f2c

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