Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6d5458177aa899…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 14:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d807d0c78451d342c3dba658db67a509 SHA-1: 48760d99ab28808683b075912c21cbdf012365cc SHA-256: 4f6d5458177aa899e14e0c4f142230b1fd74984d0690e14d02b67fd9fd9888ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to host phishing pages or distribute malware. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating malicious actions. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=android+traffic+sniffer PDF link annotation
    • https://detectagsafety.com/ckfinder/userfiles/files/tuworudi.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/bogomanewituvomig.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/fijufa.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tunesodelizibubuloxif.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/59782320285.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acd4704f53---xijogitigufajawuku.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/24508563034.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/85353907148.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/85381389917.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/bezutusipusovopasivoz.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8d1e8672d01f029120ddd940f7d6799/wumufigasetevomukasu.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/30983396891.pdfIn PDF document text
    • http://anpharma.net/upload/files/69336756391.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/4578764325.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ja6t9ot1pcfr2jb50bt1sl13v3/94908965298.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/97567508984.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/41244988673.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/25527499939.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384d8167511---topedapokitizitizumedu.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/tasowafixubaxaf.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ae1236a5e2db90dbf5420fa3bac30d66/84638751040.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 17944 bytes
SHA-256: a312af33a1b58f5db615e9f947ade116461122e01f1dbf62fb2cfc4dc12708a3
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 10404 bytes
SHA-256: 6871ff1270c62ed3f49d80ea758bf9f1b6769fdcb38d6780e80f61a6ef9b9f47

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