Malicious PDF — malware analysis report

Static analysis result for SHA-256 70990f84539814e8…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 22:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cc1ac501994f0d5191cc4f178d04f977 SHA-1: 3f76d93fe800a36d9fb55d10d409468f7d033da0 SHA-256: 70990f84539814e8dbda7cb49ff63aca5eba5a6ad042e0cb1083ee51ec1898cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://lamaisonducoeur.ca/upload/editor/file/73654054718.pdf In PDF document text
    • http://dhleisure.com/ckupload/files/31443705988.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210624221557.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/38521bb4491a5f7d677af283da02f0f4/vakizanejexuges.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0642608001625594304.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13a3a45a63---muxewutaninubi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/61327766238.pdfIn PDF document text
    • http://aimic.com/userfiles/file/28148039007.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d729b27097---digelud.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/48716190123.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/bevenebabimamibi.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/31dgm48q4fs4bsvb2qdpij7u09/setodexidizodabidorudoxe.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9438776f8---5397330456.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/sozujugonalik.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2qccmur9r4el5dbs7ug0foajou/74673221346.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zusowinikilanudominevej.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xopuditebana.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/1b3ab24f51dfa24bed36cc1920fe8b19/58510490115.pdfIn PDF document text
    • https://mszukam.pl/dat//file/lojeza.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b21095d09cd---pexofa.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dinekexixomubemigap.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609626260d85e---6152621925.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf9202803---85062023816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=macbeth+introduction+paragraphPDF 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_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 10812 bytes
SHA-256: 46142a35cbd8d75dee3cefaed39df693567e31b5f714659f7966782e035bbce9
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 17480 bytes
SHA-256: 0de10071044a203304b584371bd855d705e6db819fc082085d4c099737b167a7
font_02_sfnt_off00012f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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