Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d691ebd0902a40…

MALICIOUS

PDF

83.6 KB Created: 2021-08-22 01:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c476a6954f042a08c1410627cf75a887 SHA-1: c6843c693e1c399d3fc57007c34a7763e6752deb SHA-256: 89d691ebd0902a40c7eba44f21c7779d8ed3ab20d9e3d6875def08a08ac3cffe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and functions as a link farm. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous external URIs suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.mmd.ntou.edu.tw/ckfinder/userfiles/files/47699348003.pdf In PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/sajalasore.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca5788a4ff---dutadaboxu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3f3aef26---26736526976.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/99070076883.pdfIn PDF document text
    • http://teresachild.com/upload/files/23357715912.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/5768280576.pdfIn PDF document text
    • http://chineseclothingonline.net/File/joralunegumutozoxezep.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/71358264978.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///wigevomofijunelatev.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/819177372dd56047b3eeb70426246a05/tizomafenufosenukebunax.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e11155350---4708761733.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ciuuc197hl7bvomdis3adbmbm5/kexawifelifojugarefe.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160889d00942ee---97593839934.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/kifobudiwif.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec437bb866---viruvimofob.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/womarim.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081389a699f8---158717569.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec742a68d---54826105708.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/31055014bedd19d6ceb6894fed835feb.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210610143433_e8rwae.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/kasulifim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+hydrogen+atoms+are+in+2h2o2+%2B+h2o2PDF 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_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 17276 bytes
SHA-256: bf8f2db1bfa1f7475a381c2cedc9c14f4c90d17f53d35edc16c01ee78c526a39
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 10960 bytes
SHA-256: 0141677677c7f81dacbc80c2ac40669fabed1fc797148c5ee57b648c0f48fd3d

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