Malicious PDF — malware analysis report

Static analysis result for SHA-256 858289b715daa2d4…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 00:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52e6b7047c0f8ce8aeb073e9d7820ca0 SHA-1: 7a660fb18aa3f56af1912659ea19ae6b287dd1b9 SHA-256: 858289b715daa2d49f7d5b264ca7806244e61892b718aa2bcf5fe241faf3a30d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/50c666543e4db10b7787ce62814852d1/52211475427.pdf In PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/7863015984.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/75856679739.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608460c5caa90---36418116834.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/bugizenewubaxuv.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kevudiz.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3e7dc86b---25756529940.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/kotajevupizofawemajupaken.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb0609134---17493615747.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/sawavikagi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2404a39aba---pilipodonid.pdfIn PDF document text
    • https://airshow-bg.com/file/wusowobebaxokowirider.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/zigerevenugo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/638b592c47ba11d8bb2321ac28c2eee3/86506890228.pdfIn PDF document text
    • http://strandedtattoo.net/file/jilibekalatogexo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6a472a48---4983870106.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701bd31a831---86754877545.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9e08047c934d2f0fd3519426d7c2593a/pibozavamefovoto.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0f691c41f1512559244294a0acff19de/gorivinutokitupid.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2n1io9nmk26bt9lv4q84et71i7/jolesexeral.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5df0faed4b---teluro.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/bafulejabemexazibepebit.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094921fa8302---wusov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=2012+chevrolet+cruze+manual+bookPDF 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_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 10892 bytes
SHA-256: 77538cf667ef3748fb47d47761843a4d092e83f3f58ab8a9666a864d4c3719c1
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 17872 bytes
SHA-256: 00391d16089ffc70a7eece7cf58268f3e27b69d89adf2a90b7b288ad5afd7a65

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