Malicious PDF — malware analysis report

Static analysis result for SHA-256 5945b38a44ee675c…

MALICIOUS

PDF

96.7 KB Created: 2021-07-22 15:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7269382651262df68b288efc4f7b9011 SHA-1: a795b85817d95af43b9d0554fb6b3e4241eecef7 SHA-256: 5945b38a44ee675c185940d12d5d860ad96c08d74c5f9135992afc654b297c2e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting a link farm used for phishing or malware distribution. The PDF structure and link farm behavior are consistent with a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a250bc002e6---daniwexikavov.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/37817794846.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440154b5ca---zibebuzameserabegajufa.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d13e4d37c435bf7d467aed740d52eabe/detanexepumetotizogukiti.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a0389dbae456bdb3bfe94dcdc35cb12d/jasizawurevibijaje.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/bonikutibiwefijigudegi.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/53763915918.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1251dc537---5549662494.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087429f2b28d---kadumizeja.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/zutubopujituxotesax.pdfIn PDF document text
    • http://specimport.by/files/files/xilezukotiva.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/93465452446.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/kunadezoxobanonobapibu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/02723b7692d0265860b0c74a6fa064f8/95899389983.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703bd77e643---pavikevafovedakibimazu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jewavemelotapodunerix.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d89f4179---rubiwav.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/zidikomajad.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jukulonewipezesorewujagif.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e8853fc88f97c7288cb5a0f0f34063be/42701355909.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062514043136.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/bimizutimubor.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/29004265019.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/jalerinirumozakusixani.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073b70550639---87250795619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=second+tallest+tower+in+the+worldPDF 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_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 10628 bytes
SHA-256: a26e74d0513fb57f4968b302408a2f9267f1d0751c7c6778df55c59aec163543
font_01_sfnt_off00012eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEF 17396 bytes
SHA-256: 28bef1a149260ff4fc391500047b6084750820b814006ea6a639d7d4742ad403
font_02_sfnt_off00015c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1