Malicious PDF — malware analysis report

Static analysis result for SHA-256 4258d05f41efe84a…

MALICIOUS

PDF

74.0 KB Created: 2021-06-26 06:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86202fa3755407e4a77a15df7b7d8719 SHA-1: fcef45b368afaceee93f5564a567b8608aa8ec27 SHA-256: 4258d05f41efe84a96b52adc93dee901ae344a4060ce20826b2a69bf0751183e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm intended to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hanhthien.net/uploads/file/78214627542.pdf
    • http://stylekd.ru/files/lipumudekopadoku.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b051325c91d3496cce2e232ec28529a3/95988760617.pdf
    • https://camelcarpet.org/d/files/maluwikosazokizuma.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/005d02bb4378d112778351695ef6d1cc/siwagexesulidofudoleso.pdf
    • http://elm3rad.com/file/13612093675.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b6a0aaf2---50450616764.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db108d3420---dexemewuzujefetefedipopu.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/sfcdrs9etdp7dtqu926klq9cjl/towoxoruzoxol.pdf
    • http://ahcxdq.com/uploads/file/140415435427.pdf
    • http://files.ibiza-ferien.de/file/29182210635.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fc1ff6c9145d171d941f5514cbe46490/42530655751.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/31300518523.pdf
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/tovovilimifuwagevovusumeg.pdf
    • http://alumnicollegedelunion.org/clients/76066/File/jumabuwewoparosuzigimo.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d337e57a4---61958538487.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea930b1de---51130823814.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0eeb6c9b1---52092986380.pdf
    • http://bellina.pl/userfiles/file/lexowu.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea81a8693e655804aa05c3f6841f4036/lisebidokijezupulel.pdf
    • http://gorisum.net/fckeditor/upload_file/file/pexizifepobas.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/h31mc3f8jlhffrsf7of50ui7ql/nogadepuwipe.pdf
    • https://vatlieutaphu.com/upload/files/28901123536.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b88c4fdd84087fabd84fb3657df80cbd/rilawivakojepeg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sports+exercise+and+health+science+ib+extended+essay+examples
    • 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_off0000be5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 16792 bytes
font_01_sfnt_off0000d671.bin
8fd0d9964e22df347b6f835b55d1294a7f0bb6df7fe1baed84f4d6fddd23c5c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 16300 bytes
font_02_sfnt_off0001006b.bin
1e4f55ca99b423e31327ca07a56fbfe9e0f0f9cb68ee14fdaf7b5893c49569f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 11212 bytes