Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d031de8473ac47…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 00:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81001fd90f8a13b6fcf35638d52dc42f SHA-1: 4b3407a0e5acc5e65f439f030920c34f40380420 SHA-256: 90d031de8473ac4784e5e5282fe6bad49325523593713cea497bf6c5aa3179cd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or redirection attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to sites hosting further malware or phishing content. The file's structure as a link farm on disposable hosting further supports its role as a malicious distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=mockingjay+part+1+streaming PDF link annotation
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132630dc91d0---jakopojemetexupovuzug.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/bumasawunijuxiv.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210908012024.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/79841019521.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/gorivokapunuf.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/46691446342.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161308d15c214e---vukemaburibelegexi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134177a982ee---batupozawel.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109090301187198.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/gojit.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/79512081063.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/90744214719.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196738354886.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bf6ed47c5cfc416187513d075b3e352f/fovowesejejukilapinem.pdfIn PDF document text
    • http://kisito.com/userfiles/file/33959006730.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/osmb3gh8coiv06n7mpcqjfqce0/mapapalibupafifokebobuj.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/mosorudivesuna.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/nukijoxitoxemifelovororab.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/48634182957.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/33959869433.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/61587061357.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/93822966526.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/depopalomelelajivep.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/33147143296.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_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 11052 bytes
SHA-256: d612fc2464d7bd75e682191170b154b64963fe9521dfbf47b57bd9d77c208f0d
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 17964 bytes
SHA-256: 8922273cd95d946909e3ddfbd0552a11638251226239fdd9b33578c024640202
font_02_sfnt_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.