Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c852f6e077c00d4…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 13:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9182ad2a35974183f3c0024d4665a7b SHA-1: 67f900aa361f8cc3f168ac3f41de4b3909f4328b SHA-256: 7c852f6e077c00d484775498e34dbf4791ecf76c5d27a1dc5efefa588f972122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to lead users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/249e1d96f0c5de819fe58ba7f6f3c43a/tibanakezatif.pdf In PDF document text
    • http://mdsalon.ru/img/lib/file/nimikipixenodakipunimol.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vulasabutivagagez.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d21f7b237---nizebunuxema.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/254ebfd4528fa90b89dde0b00c782bea/wiwowapeso.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fuwedonewowumijef.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b05951bae71469d86e6ba3696b24876d/39001333227.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab02170633---rozogadowobinirukido.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/239cb26c8b40cd5d8abb2ebbb7c3abfb/62900051272.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7b671b32e5163eb7eeda9f3668ac86c0/tosogep.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/lamadumagakunigomala.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gituch0eeriroquj2t6u0nmj51/56367116289.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0e0b5d2f---7347251683.pdfIn PDF document text
    • https://pellevah.com/upload/files/77051119441.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/wumenoso.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210529084203.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/5121690243.pdfIn PDF document text
    • https://p87.hu/files/ganenaxawuna.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/ruxawapewakelumusifubu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15784e9040---malaxivezemadeloferede.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a5a988d7641f706db4aa8bb917908cbe/jujuvariwowigi.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/95557698081.pdfIn PDF document text
    • https://elektrona.cz/files/file/89466933330.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0e61752e9---6553743529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=academic+vocabulary+list+by+grade+levelPDF 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_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 11008 bytes
SHA-256: febf14f122dc44da2ef95e6247d2aac935d944031344106a9ff0c54ebf0a230e
font_01_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 16256 bytes
SHA-256: cc193f14cfca8e740f0b688fa1cb06de98c3ffb20d3559d8cc4abd0a5f323e37