Malicious PDF — malware analysis report

Static analysis result for SHA-256 583e57c2166322ea…

MALICIOUS

PDF

85.1 KB Created: 2021-06-30 12:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e2367b552f2837fd3d0993e29bae650c SHA-1: 76ab5b724cc0fbb2f2da180ac01acbdf5d3ada94 SHA-256: 583e57c2166322eadfa4d5c8314265ba889ed8ea7137d386598754b6bf7d48b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as phishing or a trojan. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7d78292c3---nifogukejinubugazabenen.pdf In PDF document text
    • http://kameleonhastanc.hu/files/file/64421711996.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608063bf835ff---dulogula.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/b633143fe65a80d4ad35df94f1bbf498/3441866243.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/boxeputakujufuviniru.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c41b5a715ec73ac7b1a1f4fc936a3a0/tobaleranezesuxives.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/74409123534.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/64440861190.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b6038a56---sumotepokolomag.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c783caf316e---roliparosibitoxowaba.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608920b443d5f---18730413042.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/65053638132.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8c6047de---xamukezetifanetiroz.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3tlsr721205r83mfn4ulcdnir2/74304825982.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nawobovoberawibo.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/nugokulafogediradogap.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/29f469c6b43e40589e55da5bebbea494/15167607431.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/banikekepanesepeteku.pdfIn PDF document text
    • http://mesterek.net/tmp/93290523477.pdfIn PDF document text
    • http://ashioke.com/images/library/File/96482218967.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d7dcd55a---84565112113.pdfIn PDF document text
    • http://qctc.vn/upload/files/jaxozedosagixozazewiluzas.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/dekara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=russell+pond+campgroundPDF 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_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 10812 bytes
SHA-256: 906a6d81dd4815e97a588872d7f2a761c11043441dced190f543f38ab9392084
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 17224 bytes
SHA-256: a44e879a2c12ae4841b8b6d755093d02b1e2ffcc95f083eada306df92b1346f5

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