Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e382a456c8543e…

MALICIOUS

PDF

86.5 KB Created: 2021-10-10 04:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0ca4c388051f13468e364d93063b8de SHA-1: 6fa9481462c64a75768042f04f096ae8f45321b1 SHA-256: a8e382a456c8543e12a1e9bcdf8e67bae947cfdc220f62519f61e0dc84cbd422
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other suspicious domains. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://wastran.ru/uplcv?utm_term=diatomaceous+earth+in+the+vegetable+garden PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615df6ce99fed---panuziponorepoxes.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/ralujejenedumabebexolusu.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/tumunekepi.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/55218975440.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615b4879351d4---38603017495.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/89305508010.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/dewajexogopazisaro.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/pomuvilinuvon.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/pidonezilopikoradizo.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151bf4485cb7---49821354574.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/bemesatuluripoge.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/60004987282.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/91048288585.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/76930629616.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/65005698709.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/52298656565.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/seben.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/68834659940.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7160a77a51932cdbe885dd3129d1414e/69035976243.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/74391632861.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/96528446995.pdfIn PDF document text
    • http://hengtongblower.com/d/files/bujigaredajatotevuxo.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/tuzowapozomuvoxowon.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://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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 11124 bytes
SHA-256: 40e615d127de9923bf56e44ab52d2d4ebb3fdcac1f9f91586104a52da17cff12
font_02_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 18880 bytes
SHA-256: 7febebb2ea95d04d1f8c990f1c5bf9ddf200f00a226a6101de414fbf8d4889ab