Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c869beb08d1d25…

MALICIOUS

PDF

87.5 KB Created: 2021-07-18 17:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59d5d72f06af4932fcfbb81d5389cabf SHA-1: f60668a61bf4fd9dc12379a69abdc16d944cc591 SHA-256: b6c869beb08d1d25e8b03181f93885c24ab6527c9473917723e30eeda77bd051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ufnk.fr/app/webroot/files/file/93649793477.pdf
    • http://boothbayharborshipyard.com/userfiles/file/jubeto.pdf
    • https://myphi.biz/nbloom/fckuploads/file/68675960393.pdf
    • http://brenna-ski.pl/userfiles/file/83309958227.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/wawageletogose.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/dewasupolovepiwawaran.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbf4b6dfd7---64296246235.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/563vo8ni3achgqsj6m1v8av5cg/41205021306.pdf
    • http://stromzeleny.cz/file/33970389681.pdf
    • http://phanbonvbm.com/upload/files/76036476362.pdf
    • http://billedbutikken.dk/articlefiles/file/26832620632.pdf
    • https://arte-salon.ru/upload_picture/32393087580.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094949e94ce0---fadapiloboviginudat.pdf
    • https://parklanehotel.asia/userfiles/file/21908465510.pdf
    • http://diamondsnspurs.com/clients/12200/File/jowazovavojefafekojidaluf.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2846e427b---9283633672.pdf
    • https://factinet.com/uploads/files/27870970764.pdf
    • http://zjhywt.com/images/upload/File/didurexolorepuramidebalov.pdf
    • http://accessprecision.com/userfiles/file/52483450109.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lpbbebvttjaengdhim5emgojk0/81822217226.pdf
    • http://footstepfloor.com/upfiles/files/59947347215.pdf
    • https://mytopics.it/uploads/file/dokulizinuxadiborokir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+hard+is+the+six+sigma+green+belt+exam
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f168.bin
2db4104d50189053d6abd89eec3c82bd26ae5595c47a92b40c1fa635b840cee0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 11012 bytes
font_01_sfnt_off00010aa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 16792 bytes
font_02_sfnt_off000122b7.bin
e1d7ad4320accbdf0c5895899c983b70764ec1fbf6d61d19d5aeee353c29aff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 17584 bytes