Malicious PDF — malware analysis report

Static analysis result for SHA-256 5297f1867be2f6cd…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 19:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb3604d4a48823a712ecf16d5f43b4fa SHA-1: ef4742d512d437f5a3f20ebb864cddf8f23decba SHA-256: 5297f1867be2f6cd910cb9d01a969e8e769791547ea30c68e123ee77ae445dbe
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gaushalango.com/uploaded_files/userfiles/files/katogaribatevapup.pdf In PDF document text
    • https://ideylia.fr/uploads/file/55198056256.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210908004559.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/89202115044.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/4009830729.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/xikijebira.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/17836760633.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/52952061513.pdfIn PDF document text
    • https://expomediainc.com/upload/file/17342832198.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614181b2af795---duzimanevoxutimolewafev.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4468q6b5k1qbbj6gsegg23igtf/mugokurimunelulatusu.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/nusoneke.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/vosumuz.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109080217552652.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/lolumamodujevobevijuzuru.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/66854056965.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/68193158214.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/9147400495.pdfIn PDF document text
    • http://friulanapanini.com/images/file/limewofepitenesetazor.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/57194363063.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ec6b5ca7164f855e1cb6265b3ff61910/kefudexufemofovibixopu.pdfIn PDF document text
    • https://pr-dienst.ch/file/gofipopimewuwozo.pdfIn PDF document text
    • http://cartopack.be/Images/file/97676812597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pirater+wifi+sur+androidPDF 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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 17212 bytes
SHA-256: 2133f81a54014b201d6d5a4544386dd92fb3c61f0d784ae49c8822ef070ac53f
font_01_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 10488 bytes
SHA-256: 96a6958a7bbbf3bd73743934243fb3343c67b7559298c2139c0e3418e8aaaeed
font_02_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1