Malicious PDF — malware analysis report

Static analysis result for SHA-256 4138823fd61ddbe7…

MALICIOUS

PDF

77.8 KB Created: 2021-09-27 09:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a05f55b3e8d7a640ca6a92a0acf648ff SHA-1: bbd200585a23e89fb6229c413764aa6010d83878 SHA-256: 4138823fd61ddbe724fab4a168832ffe9fd949a189880384099ef66a25148b30
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 within documents. It also features numerous external URLs, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=conrad+heart+of+darkness+pdf PDF link annotation
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161414b82e40a6---65861089645.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/rojuvarutanabixaxujeko.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/60246095844.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b94fdefbac04c3cadf45447b247ed0c2/mubatebituduvesup.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/98209383732.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/52299903219.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/darudotowavesitoto.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109231406165849.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911110622452737immji8.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210921155539.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/veruxudakixubekamu.pdfIn PDF document text
    • http://premo.at/userfiles/file/28978837553.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/nawelamusodajopegegitib.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/naxexuwora.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jncdvrlbdnulqshoa8ukehih12/36015886724.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/80389055983.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/daparotof.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c88e317d2---napadopofetekixoz.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f0a385b7---42162940408.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/9842804649.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/50469449551.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/satakozijurejizuw.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/kidexobetupizu.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/435587741.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_off0000c26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26B 21148 bytes
SHA-256: 94c2e9f73db57fd71367670ddb5f8e7f6547ad32743151d0107c2e885cdbee0b
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 10580 bytes
SHA-256: d5453d03b3b5180d0001382cd3d0d4da34a19733eb18f6ff05b2630201853d6f
font_02_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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