Malicious PDF — malware analysis report

Static analysis result for SHA-256 f342ca2fee3bbc86…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 12:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a0d240ee23a7a6dd209d829e1444f9d SHA-1: 83614c06b1674edd85f2cfcd5ac37185e177fa0d SHA-256: f342ca2fee3bbc86999873fc2bdf89f02195d601eda2ce3a205ad12e9eed6244
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=microsoft+excel+2007+bangla+tutorial+pdf PDF link annotation
    • http://nfrostov.ru/upload/files/putezenubujofav.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/25955206375.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/13571352424.pdfIn PDF document text
    • http://vce34.ru/attachments/file/julexa.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lfplo7r7dqpr4red9q6pi6k346/86364203255.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/badelenuzimakimofi.pdfIn PDF document text
    • http://leguido.net/files/kikunureki.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/48804049721.pdfIn PDF document text
    • https://labelmarket.eu/data/file/jofulevazefase.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/26860452870.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/ruwubunonelelome.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/viwawuxediliwejis.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/72768371385.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/zonejugulelajefewikum.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/wavixufenebona.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/21427957545.pdfIn PDF document text
    • http://slovoveri.org/userfiles/zezodadotijeniwuputiwufe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140b3385f775---lujuluzolovowegewujoje.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/zuxovo.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/73872473155.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/06ef625b9c4db17bcb81c6d44f02d5f0/bipevedanuzadanode.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/42483893421.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/gafus.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_off0000c557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC557 20036 bytes
SHA-256: 6c5a6339b8bdd44e6abcf50535f09d2700d15a5f9b907ec4bfe6be51f0088322
font_01_sfnt_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 11420 bytes
SHA-256: 8a40f493c5101c10247d893d0984562b4c260d1eb78cadfbb2be4c521b9ce2a4