Malicious PDF — malware analysis report

Static analysis result for SHA-256 3836196bf67689e7…

MALICIOUS

PDF

95.4 KB Created: 2021-09-19 09:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2038c94e25b14779fb464c492136eae5 SHA-1: 844dd1f67028c070090f2f402f07cc83a49cd830 SHA-256: 3836196bf67689e7fa1cb978b7520a34d78bb2accf2fc794a7c4e6a41451aa31
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dbcasagayathottam.org/assets/uploads/cms_images/files/xidisivodaxozilimawogo.pdf In PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/37468150291.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/53361218094.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/gidadotukipefukiraxajet.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/3027792610.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/tunorebalalozajokisug.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0376a8f1---luvulaxirezewogisom.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/81515739277.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/pelutedodataleduxe.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/5397487936.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d137544a27---86069066141.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/vivebiji.pdfIn PDF document text
    • https://cubic.is/userfiles/file/mumoziridusebovirawu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/tk4helqnf1mkvmq42opg3k5edp/35886005804.pdfIn PDF document text
    • http://kdekdyjak.cz/data/forejuwoxidilo.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/16372901370.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/zovedapotuseza.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/16753892406.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/sujidogotu.pdfIn PDF document text
    • http://elsped.hu/files/file/vatutajetilabixe.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/172100008979.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/19068384911.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/83189512697.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/mesovivemapevis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+movies+online+hd+freePDF 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_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 19616 bytes
SHA-256: 3ffd1bdf5d6c409133bd2f18b64f122463fe49607fc3559b7b93155397b70578
font_01_sfnt_off00013efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFC 10800 bytes
SHA-256: 11e09b66bcabd43a73b09b9b24ecbc497c959d9d341fc5fd948e977bd9fa4a17
font_02_sfnt_off000157b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1