Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4efec8a543d560…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 20:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78dcf3fb7f26b149fdd3c7dd0f9ebf53 SHA-1: 47684948f37777eef087b0d7cc0e116f75d6769b SHA-256: 3f4efec8a543d560bbc09ef7d80fc3a7749952b0647602610c50360e8dc7082c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • 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://aktifithalat.com/resimlerfiles/42239718221.pdf In PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/88516262377.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/zezomukivafowoxufiw.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/vemexezaruvejesenukabe.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613033465c1bc---31123214900.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726860b1d4---26477571416.pdfIn PDF document text
    • https://menu2uplus.com/images/file/fegused.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8e2c0d2ad0747d49b1f9ba2d97baaed4/32073045404.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/81084985921.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/wazatakivajik.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wabivuwesolu.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/papesetigakeluwofutedulis.pdfIn PDF document text
    • http://uchid.com/uploads/file/30656035897.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/dobupakugosiwimepezejaweb.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/97104225149.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/kigufoperimuk.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/24782311027.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/xaritifezajon.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210907034814.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/80395819111.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4f230d0a---midoparita.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210907064700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=reward+management+alternatives+consequences+and+contexts+pdfPDF 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_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 19800 bytes
SHA-256: 88350e87dfdaabb66ceff071a25e0269c618960da83409e2d3ff0cb66d3beb28
font_01_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA6 11508 bytes
SHA-256: 70acbab61e9b702c35319a2a6603784e391ce061915b849f971ce7bb21f1e63f

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