Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03dcfd299c919a5…

MALICIOUS

PDF

90.5 KB Created: 2021-07-01 00:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac937671389902cd45284e585c360f91 SHA-1: 4a2efca1993b6cff001f0d60e573f359557b0190 SHA-256: d03dcfd299c919a5f3543e063c4dbc5b2909b0a30481df798212ab97cfaec1fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fd0169bc---9042703207.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/f26lmg12ch2usltvj1roh96id2/42092596955.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1db86717ad563c98f90d1dafa678f9f1/kifegilijipulapebeje.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c8b4c9f3168050789a6a8b9faf0ac75e/88157504922.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/sg59m6te3hfu8mqaa39chtstso/87737872137.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6de135e8a7a2b714b00426bb694e906b/52228032976.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d7eb2c2f54d1d512d7c039452354e563/95929338853.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c8167940---49686245850.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f29790c6f---322761024.pdf
    • https://luyenthitoeic.info/userfiles/file/58865596511.pdf
    • http://starrwindow.com/clients/863399/File/nukixewojaxomapuwogis.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210617182510.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16086f23fb83ab---80500514874.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc534215af6---61906103839.pdf
    • http://beijinghuojia.cn/userfiles/file/28691525563.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079008669fb3---vebetizevegulejejoto.pdf
    • https://candbco.com/ckfinder/userfiles/files/sodizuwiwofulaxuvakoruf.pdf
    • http://exlluprimebrochure.com/ckupload/files/gepadoxofijulikobosis.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2b7e8d0c---pasogavavuzisud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+dangerous+animals+live+in+the+amazon+rainforest
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/93d856919a0120570b23deffa88e517c/92439689118.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_off0000fd07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 16792 bytes
font_01_sfnt_off00011519.bin
094160bdc89a7975b46bbfb943789f8fe04ca3a176742b69b7c97170a2c419b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 17880 bytes
font_02_sfnt_off00014384.bin
5382a9e65120b167352dd9c2320ee76c6e9cb4a0643f65b190f82c90fd8e0c8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14384 11020 bytes