Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee715d26368fbc7…

MALICIOUS

PDF

86.4 KB Created: 2021-07-02 03:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e844f55ecac0e4b1e287c9f41463dfd SHA-1: e3f26b8e8282d7d8991b878f3c9db8ed8e2119bd SHA-256: dee715d26368fbc744c5d62f8b04752552dbd7e3cc9e10fd0343078f2aec0578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely serving as lures for further malicious activity. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://catamma.ru/uplcv?utm_term=you+are+a+sight+for+sore+eyes
    • http://visit-pune.com/userfiles/file/62710668068.pdf
    • https://noddy.nu/images/file/578001651.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qjhv683tefjtf4m1atga9876rp/83147429348.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3e2dfc1c---fepivel.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9730cdddb---1206195405.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/t3kdu7cdbtiggbtn83uoktgh51/22693660039.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a2051bbc4b9---rafusoxulurutogijadu.pdf
    • http://alnadaoil.com/userfiles/file/99941595201.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d489041b5---lujobugaguregozosibowepi.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/63431960db2443646f2831750514b513/54628601053.pdf
    • http://baohanhranghm.com/upload/img/files/rezave.pdf
    • https://aashianarealty.com/file/kifilutimeguzodakoxi.pdf
    • https://maydangson.com/vietkiendo/upload/file/4216464663.pdf
    • http://driver-jazda.pl/upload/file/dudibuwifogif.pdf
    • http://hayatteknoloji.com/webimage/file/16729606762.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4ljogdae972i2onur85km2dbeb/49676421573.pdf
    • https://aashianarealty.com/file/wazurosojevuk.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/go3c05l48ggvrcuvfm7lb4e8ga/tofimug.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff2bacc9106b796856995553bcc55096/gulomud.pdf
    • https://marosme.ro/hirek/file/54190583908.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/perenirex.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_off0000e74a.bin
06cae4dbb2cfce89f56c4382dbdbd5ed66371698c3502eb95984a0f20f007489
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 10540 bytes
font_01_sfnt_off0000ff84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 16792 bytes
font_02_sfnt_off00011796.bin
54a72bbc66e1c6d5513e5c64725fbb95dc5833a7c3c769fd35a2b0b901991934
pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 21256 bytes