Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca17775dcbf5bd8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-27 04:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bdb3254972d7616c963ade71eb69a735 SHA-1: 78a3b69ead20ad2f03f3a1a220953ec08a533dd9 SHA-256: 1ca17775dcbf5bd8f0ca85a5bddd6577d979e1ff97481e1ba5e012577739d360
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised websites, with a high ML score and ClamAV detection confirming maliciousness. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/99d1844947db1e2321e518c3290aad0c/60205863225.pdf In PDF document text
    • http://whatcanidoforyou.eu/publish/file/nukewakidiragoza.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b2d50b83e4469729e3e4165771e78736/bulogix.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/92407690619.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/2005165395.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/98855091523.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/6391411379.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/giketorir.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d03fd43dc5d022d12b7d97b4fd958206/18177719068.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/3507379070.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dutegipapasovusafijigakel.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/mijujimuzunewarofiduf.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/vazavekafasobi.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/maxawivivumixedefiseti.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/wipofidetiwojex.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/94090689339.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139c237c8b87---13682761468.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/julapekonasigolopixa.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/93287798885.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161343436ee0d2---xavimavalivono.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/suzimusiwidolibukazupen.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/sureteduterarabunabibaj.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/37152472569.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/wunoguvegepugobune.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c1b84db573cb43aa510d270909448966/28603588902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=grand+theft+auto+ppsspp+filePDF 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_off0000b89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89E 18488 bytes
SHA-256: 478828657d4a4cf3fe9176d702aee1641e907ada501c696c5677ea758cd37cbc
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 10732 bytes
SHA-256: 40454956f8440478c5f404d4175689525c299492a422e49048d5b766789bf5db
font_02_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1