Malicious PDF — malware analysis report

Static analysis result for SHA-256 70310e7ce3e24a86…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 06:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f816e8d9b7cd87a14c50d15eeb2a244 SHA-1: ca9f9a5812716725ca1ba12eff2edfedfa84e0f1 SHA-256: 70310e7ce3e24a867f5e59e002e5b789c0416f630a26b3cbb57ac0478363ea8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised websites and potentially disposable hosting. The presence of embedded URLs, some leading to PDF files hosted on compromised CMS uploads, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/eb082fbbeaeab878ab4f80b2cde134e2/modunoxo.pdf In PDF document text
    • http://samnakthodrahassob.com/userfiles/file/penekokeriladexezikovexu.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/95568067646.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/keremexijukamowu.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/jekiwomujubugotafoseguzad.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ff40j1s6e4q48caeqgq05dt3un/4197864159.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a068be6f4c7---50370870725.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e33669182fa---16046707442.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/medewenexo.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/84547919644.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7c7f00efa---kafavu.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/jevemisuja.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/loxozozakixofef.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823efca244e---10059445293.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/memodatinuroxozafi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/14862159385.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/setatidikupenaras.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/gifupuwisorulotak.pdfIn PDF document text
    • http://kesifveotesi.com/files/mojulipo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2e866402e1a1747334905cc0f7fedc8c/29965321788.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/89441664245.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffcda30453---33336113537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+electronically+sign+pdf+documentPDF 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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 11252 bytes
SHA-256: 638151ffdbdfbd375aa16988dd17db942dbb882508b8aa35df3d23d7a8280251
font_01_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 18368 bytes
SHA-256: 1e747dd50b5d1ae643650f894920038aa30d6bd41878fe7acfafa94b6a90ad65

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