Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15b7139b5b87cc1…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 17:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0b955a104cc75279d4513cf4838d771 SHA-1: 78227b79c4865502277ce9bcad0b1d21c1158813 SHA-256: f15b7139b5b87cc110dae3f5ad41bdb9eedd1299f69ed0d53bcaaa698532f4f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest the document is designed to redirect users to malicious sites. The presence of JavaScript indicates an attempt to execute code, likely to download further payloads or perform phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=harry+potter+full+movie+english+part+1 PDF link annotation
    • http://anticacarsulaeborzoi.eu/userfiles/files/demajimodopu.pdfIn PDF document text
    • http://gibisch.org/files/files/zemukafopivekemometix.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/10296404846.pdfIn PDF document text
    • http://chinahongji.com/d/files/gilavutoxelozowopon.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99621529597.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/14884227434.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/vosideru.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dc4a3c795b1ee931ae7ba6fa2247c751/95496321116.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140322506ab7---46334863964.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/746c6ec9d9d3613c707c4d9d3880a76b/bezabajub.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/rududesexo.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202193182202454.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/norokusizi.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/51325881375.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/90203805844.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/01te7q020ekh8tej4crbfv6ltd/fevedosibej.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/buvavoloxamugunazi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161361ba078cdc---63426915444.pdfIn PDF document text
    • http://hongdacable.com/d/files/4934180936.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/43603751510.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_off0000c8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 17080 bytes
SHA-256: cdd3d75bd36d2ee7e2b433370a20e623fe361312f020a9d56c01b477378a94d1
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 11128 bytes
SHA-256: 7af722020ba7b7f56848967da91452f01c123772afd07c8add64e4203a6605d6
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1