Malicious PDF — malware analysis report

Static analysis result for SHA-256 857d519c462aa836…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 12:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d422d13441d7f695e5546b5a7a52bf9 SHA-1: 76536481c169ef9895acd8fe0119ca35ffab5fa2 SHA-256: 857d519c462aa836bff37487c6e0b9726e1b24594c137a94d5738f633088e21e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://idolyokocho.com/js/ckfinder/userfiles/files/33924197188.pdf In PDF document text
    • http://grandrosso.com/js/upload/files/39885992903.pdfIn PDF document text
    • https://allianztc.ro/files/file/mebupemotabutunakusisima.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072df6637b1c---kuzizixirotogu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/140e7d2d8bc040ef0a8e62ebc01013e7/fawomovefudadikupofogo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c333cbdb22a---89393300466.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/46760031573.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/momapopuwuterikugema.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/zebutifanenezu.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/8310115663.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d57048dc9d25296a012a5c70187b9c17/41853758001.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e5b77fd5bfd2a2ea86ff815155dbed98/13647201572.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/16065953282.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kozawobugoxufem.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/wugavamom.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3ac7411c---42790433815.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/44575788876.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/54f1a66d0adb26e765143b997fa5b90b/kamutotetiganu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4fe4dc00353df0a857188034c3958bb8/vozobafapebiragamekegobe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/26032112657.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/abe0b18bfe38609ebba864b77dced732/30953876418.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf916fb83fa---2099121786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2004+buell+xb12s+service+manual+downloadPDF 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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 17420 bytes
SHA-256: b47f073ebc54468f1d9aa2ba5476404057635f943826941182620be0e6ac463d
font_01_sfnt_off00011706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 11204 bytes
SHA-256: 7b2b5670b47e1c302ae2d527e2456f5f36fa89b59ae674bd39855f43b3f34a5c
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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