Malicious PDF — malware analysis report

Static analysis result for SHA-256 09182053938a0864…

MALICIOUS

PDF

71.7 KB Created: 2021-09-08 07:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44d46c8da7dc83ce9d17834a29b10a57 SHA-1: d652b565b5a5b128d067674d734987a9b0350bf7 SHA-256: 09182053938a0864f33459685e5b6084217101be60deb1593c7ae9d3a197d78f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bacda7a59---xotekufakibadevonevora.pdf In PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30548563769.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8074425e7f---kefujoritojujekabuzumev.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/dc2dfg3a9ddneclpb3j67k7700/fifodometixorukalapini.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2a604f437---fejipoka.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/lotewelivadiko.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ree9gvv9v5jojdkjn1ga6gq09h/zozenemewaxukamanokut.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210604232557_9m0e8c.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/5sugknrg716ueah6gvaonj5qnc/velikilifigejogesu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5cbe68c35---73009189275.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/togoletobuwujawemudip.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/83790073100.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0df66159---52149110102.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7385c6b043---gotanoguviraroneva.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d33a71978ec---xuxageruzoxeli.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/61588950779.pdfIn PDF document text
    • https://webmenuplus.com/images/file/51999393448.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/gikojafezijuxaxije.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ddf94c2b78663418dc508a6ebe4ea781/tanarosotogatuzilutagejuj.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/tefon.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ed9ceec6808e31f1cfd6a3bf9b8920d1/832064607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sri+guna+ratna+kosam+pdfPDF 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_off0000b6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0B 16128 bytes
SHA-256: cc0c11cf71c65c701b0c31c39d828cbdc8d6c4b0535074d714f8f8577e11ceec
font_02_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 10928 bytes
SHA-256: 2a6226ae105009f710d8814d3ac7f47a428df15613227c5132d6c4b1fd060ab9

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