Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d64203bfdb4e29…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 20:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f93b23f7a8abd614469870de4b2806cf SHA-1: fc29aceaeeddaa8fcf98c5edcaff0337311f681e SHA-256: e8d64203bfdb4e295d998da53fc61a34dbde11ead22e74591c858073d93434ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The primary external URI points to 'smidgel.ru', suggesting a potential phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=rigol+ds1054z+programming+manual PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcafe8d5490---59551539508.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/89bf2d455177135f4f7310bf81fdfbaa/41077110141.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/19025551906.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b1db82f34a10b6994a87867028045859/9716164116.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/difemefodor.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/melalaruvikajenefuro.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/nalegeris.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831d403b737---17245445473.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff04f277b1---rupizegutarolo.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/bugaditekiwokezedokel.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/59712623008.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ef6240f3b3ef07469a89a9499be526a6/walepivaruv.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/kimukife.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/958ff37793751cbb0c30cac05048413e/fumutodobu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba719ba935---fanukigojodiwusakelulid.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/ditixasudixizobefas.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/87197546256.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6rg06ofseii58t6ml3490v34c6/94388476138.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723cf629904---57280373033.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b513eb528---31652694146.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/lakajew.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/rixizonomef.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f916b81b85---81748186716.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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 11096 bytes
SHA-256: fef18142bc7d37ba65b591131bc79251c2c16928f4e8392df1be2afd9352894f
font_01_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 18640 bytes
SHA-256: 57b8741906f79c3d274b700d6cd9fd220685860957c7b1a11b33a7bce6153ec6

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