Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45640fa24d6c60e…

MALICIOUS

PDF

76.3 KB Created: 2021-08-18 17:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bd151ba49dcab4e9db61afc6114fe297 SHA-1: f8591ed294bacdd414493c481a90b57d2cc9db43 SHA-256: c45640fa24d6c60e280874c6ec323b09573f006c02745a1ff7c2888a781332df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://irlanc.ru/uplcv?utm_term=joe+f+gurney PDF link annotation
    • http://allprintusa.com/admin/images/file/40469770279.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/dexedutiwepigiz.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/tosizozuxexofilo.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/rojugezajemimufili.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/s09va61hb2at2vqflgf6d2movn/narepagave.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/38391646628.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/91467044704.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607984a58489c---97022211754.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/nezinewezafajabawidun.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/winoranaw.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/gixosus.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/69173347706.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/pologoganexeponorinokumi.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/0d225e34709ae564f81bfa6b5735cf88/zeriwuzagan.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jecrg41a5b2egj79uqjpqmo2u6/jozamupivo.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/pidiwugazaxijuwufu.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/45160224477.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2dca387659355a7f985a404c260ec979/52262272876.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/ragut.pdfIn PDF document text
    • https://motiv8workout.com/up/files/sogidu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ggadrvj8mid49717fslsliljh6/mevodofavofewixorobi.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/94612919227.pdfIn PDF document text
    • 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_off0000c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 17004 bytes
SHA-256: 57e94cbda56a135ce8069c5a1f2fa9c5a9f7112929f4c42587146f86947a5472
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 10028 bytes
SHA-256: 5fdfe427ef6eea0f85a6956fec3e85dfd731e4ea298bfa494af50f107f47d8e7
font_02_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1