Malicious PDF — malware analysis report

Static analysis result for SHA-256 a328eab1cca2aefe…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 06:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 874b502c0203529a084c2d0b767dbefa SHA-1: e57c9a429dcf7d6f94ad389f12db49a3c1ef6e66 SHA-256: a328eab1cca2aefeb0235d21e471f9a7b7c883719385a2717eeaa628b5df8c17
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to external sites. Several of these links point to compromised CMS upload directories, suggesting a distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sparan-art.ru/ckfinder/userfiles/files/sojevimofu.pdf In PDF document text
    • https://juraganmonyet.com/contents/files/kefuj.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/62280893057.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/josezezivufaxudadeg.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/josagorezevifilorekekogis.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/daribufuwusafijuga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105a54e83b---65780280339.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/68258157958.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/fojol.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/33835330639.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/magosegoz.pdfIn PDF document text
    • https://tonitomov.com/picture/file/59231628993.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b94fdefbac04c3cadf45447b247ed0c2/mubatebituduvesup.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/zulapezazinarudewufoza.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sudesirorukoge.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130d596ef426---1983068285.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a43653609---82037665029.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/55719288315.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/teriminin.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/84005dd90bc464b93e8acbbba962daec/ninusopafo.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/vasexavepobomoso.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/fawivonotelexeto.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/52555321232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=asphalt+6+apk+modPDF 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_off0000d2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 17376 bytes
SHA-256: 876845b736d27cc5c2d30c971aa9b3eaf5ea16852a29eabaec7fa8cc752b00a5
font_02_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 10472 bytes
SHA-256: 0c309b48b29c08694ad2cc44532dcf4fa7aa74f1f43ccbe95fbecaed1c62f805