Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f0815ababfab58…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 16:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6e700d46a3bd04d841b2c9fd7329bc0 SHA-1: 7abf20b6b1e48bec96f5054b8940d733346c8ac1 SHA-256: b7f0815ababfab58a53ea75bb19519a273affee8af14df478fc2f075c7627123
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://gruppocreta.com/userfiles/files/35733579839.pdf In PDF document text
    • http://geoplan.su/userfiles/file/22493602556.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/gatopojeme.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/39149743936.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/3277782362.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/43435085290.pdfIn PDF document text
    • https://dcimx.com/files/28392405569.pdfIn PDF document text
    • http://texmet.pl/userimages/file/fakizanoxemajejo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6a5f27b87575a12a3d957a4f993255cc/poxeritugozupirir.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb839e7d98---66860876975.pdfIn PDF document text
    • https://synersys.fr/contenu/file/78320513931.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109181226195026.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/52370892122.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dhjcdqs172e15ll1j4r005n1vp/nozojiwi.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/48237154854.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/lewowijuwadibagaxilene.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/nitezopifurosupuwosijoveb.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614879cee3b48---94744758873.pdfIn PDF document text
    • http://koala-al.com/d/files/jowozevovafirumibawef.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/6432574544.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/75508707457.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/51886656936.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/nopobarefike.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/walewimaxafinabapubiseb.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/12644559422.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/zukejitefusazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=no+supported+app+for+nfcPDF 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_off0000c180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC180 10552 bytes
SHA-256: 7e35df8517b79fc3bf4e61e7b7365de06312b7ecd420b10d20576be5570dc1f0
font_01_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 16804 bytes
SHA-256: ea186108949398119cfdad0e1833ead26f63fd31b98d1c5d3aec5f9d81adfab5

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