Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c55a60f02f3cc42…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 17:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b994861f560a7ca508b8f72ff6f43610 SHA-1: 385f87461ec8f77c430f817c980ee4b7af7b1ce9 SHA-256: 7c55a60f02f3cc42371cdff5a06e315ea2bead0908eb8207f3707ee5dd36c348
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 potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hatowo.com/app/webroot/uploads/files/20064333148.pdf In PDF document text
    • http://www.siposferenc.hu/html/nanufuwatulopom.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/41604509604.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/13615896901.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/8011121428.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/jewuditejitesodasiruw.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/15834693372.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/48490144268.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd7fe3c41---66651904477.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vesusigatig.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/vutamolij.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/gukasaxozepexebogowa.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/72812872654.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/fokigetegupetafobe.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/8260214565.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/38434861932.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/41333425183.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jarizewaruvumun.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/a4dba8500c56611a5029924bbb16e070/13573678878.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/wawesites.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2l7eom20kua3sa5oibig9s4713/jabuzumabimo.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tm3l48ech2udpij2l32k4rc52f/76506971476.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/sidunulamevote.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210901185347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+lips+step+by+stepPDF 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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 17624 bytes
SHA-256: 2e4332146b062fcc19aa63664eca714acd520833a43c2cded9550389a8d6531a
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 10612 bytes
SHA-256: 423c76e1c99cf62b38158f910339a035469238bf4e0a91769941891bf401694e
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1