Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54c2a80a312fd39…

MALICIOUS

PDF

103.1 KB Created: 2021-06-29 13:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5744c83a2b580f32dd369720e7d3f1a4 SHA-1: e61ec123fb9d23d3a54ec94b26251761afc85a05 SHA-256: b54c2a80a312fd39267b08db06a4958fa668eb4290f07692346e3965796054a0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were explicitly extracted, the presence of numerous external URLs, many pointing to compromised WordPress sites, indicates a potential for downloading further malicious content or redirecting users to phishing sites. The document's structure and embedded URLs suggest it is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=marbleslides+lines+answers
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/hk30p6tbjfu10j9fbmphjt8lg3/bomibusukedufelitu.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a165787f95e---97938648013.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b450c62bdc---69443769797.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c94ee07f06c0af6bd2951f0199364be/tiregeti.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e7dc75049cac8dbee6f9f00eec5f98f5/tatolusurudi.pdf
    • http://universe-micro.com/upload/files/20210628_075928.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9c4f33d63da06f9186e487966e4d611a/49615637668.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6e2s19fc06s4ojcmlcv7n45fh2/82158856315.pdf
    • http://sattamatkapatti.com/userfiles/file/fevavonoxapudigipipeb.pdf
    • https://allcreaturesinc.com/files/files/85298360420.pdf
    • http://askort.pl/Upload/file/lajonigufozoxividoluz.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7d8f5d5cc---18141380613.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b2c41d0d9---mebadujakogalogakibore.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4cd65a061703990a5b8326d0a2f7df31/fizazanibegulipijula.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/48942704110.pdf
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/suwupokejikifonolajagimi.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ddb23ba570caf821c37f87fb7d04e551/10821960933.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b52423179bbbc1595a1b2cad219b79ac/13900436712.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/74f11cc1025ceb59e409c143ed55344c/kemalugato.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/77444081108.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104291649423921.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e66365aa957bdfc99469fe29e2627804/2275773578.pdf
    • http://perlawarmii.pl/userfiles/file/95741722244.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608601d434c6d---bofibizu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013297.bin
b28d8a8efa715180bd46ff6e42ddc6f258359dc9e0842ada53596ad4e6382af7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 10240 bytes
font_01_sfnt_off000149b7.bin
efcc99e6bb37dfc257be68d6326dbb0af6fab54074695af73c3b159edf9171e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x149B7 17224 bytes
font_02_sfnt_off000176c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x176C8 16792 bytes