Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ceff0bda99e867d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 10:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa6918e3390f9b986f629168b4b9cd4a SHA-1: 49d65a66dd3f837ff0f67acd4b2d00c219969915 SHA-256: 6ceff0bda99e867df5ec926db799b834094b13b2a0382fe36632c54ec2df42d3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and link farms, many hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic findings point to a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=rand+mcnally+road+atlas+pdf PDF link annotation
    • http://adacu.org/userfiles/file/20210618152223.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210805105057.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/79acba0214cf2027d0f04655fd6e2edb/21725720436.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bneklt1gvr8jm8touke2m6l38k/guwogemel.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1e16cee654032a148ace949d3ba8b642/mutedamarozop.pdfIn PDF document text
    • http://headrepublic.pl/images/files/50223618001.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210828122451.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/psuf6tap2eviom9ed3tkm6h76k/79529473976.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/nigupudolifimi.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/bewaniwixesomozewu.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/wutakaxum.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b16690775df---93080623839.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e191ecee2b770096c1eb05fbdd5961d2/tuvabumilegiwowuwokim.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tiferanodidazozedin.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cdec9b46b---40749965936.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210725212414.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/dezufaxozigojawoto.pdfIn PDF document text
    • https://bursac.net/userfiles/file/gilusolonov.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/tibatikamewimo.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/19956795639.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/zemiroxukokezoxuzi.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/fanidoj.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/suvotopije.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_off0000bf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF18 16460 bytes
SHA-256: c17e4333d723696f96351144bc5300e52affc64c77d578f746acf5b8b6515f43
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 10716 bytes
SHA-256: 59340024dadd0db868a410d58dc22fdbb07c438b2712ef9968d9bf815832b96a