Malicious PDF — malware analysis report

Static analysis result for SHA-256 928f13562617c0c4…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 09:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5aa8615a8536184940a1e85516822651 SHA-1: a447568744ab441b16df237388a19b1f7306dfb7 SHA-256: 928f13562617c0c4c13bcfa8e43f3de281e28658b5c0ed80aa0c2a5a1f32ae7c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=insertion+sort+algorithm+in+data+structure+pdf PDF link annotation
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c0315fce---salamebumabasisirarulen.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/aa7bjoegf8dlg0ksfkc7tdbtog/kepemibanimefozo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/pajipidoxitepamigagel.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/11592526640.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/2072111828.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/84aae27874220d6181a4e1f3a56bbe53/rexufupogamefirepofe.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/vupawiserawixekodapi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127225015e35---vivekunebenijozopanamule.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/duxujesefonosuzasa.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202108232133009724.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/nvfh8smmedj753thl7l3ano5m1/15229658574.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/saweradadomewipaj.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tnr2c9r38g90d56vu2d6corab1/zoruvepinojunokageg.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/77933661816.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/53731317094.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607febedae114---36343307794.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/vaxetalolin.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/bifefufi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/791f42c8964e6cbdb817833143d637fd/78170737167.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/65432325502.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/83589864293.pdfIn PDF document text
    • http://flexicourse.cz/res/file/89953568236.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/warotelumakogizugokurubus.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d3e360ef---zilopuwozapedawitejijip.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/89953871194.pdfIn PDF document text
    • 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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 11120 bytes
SHA-256: 755103ab6691bde5e992595f9d107cbdbe7d526a2c1f69adfb4937e820704ee2
font_01_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 20584 bytes
SHA-256: cf301d98e1f28f948fe039177f37305814826cb8dcb7698fef22da8e22dcb74f
font_02_sfnt_off000138d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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