Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29631365ebec2d1…

MALICIOUS

PDF

136.6 KB Created: 2021-09-02 10:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7998d786158dd787a7a7636f4f67f50 SHA-1: b0640a1dea56fae8d94e96f2a711ac207eeb51f2 SHA-256: f29631365ebec2d15e668320c67135041daceade106761d12da9b5c7b62b7257
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external PDF files hosted on various domains, some of which are identified as compromised CMS upload storage. The presence of urgency language in the document body further supports a phishing lure. Although no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ises.ca/phpsites/vertical_living/uploads/file/43589354717.pdf In PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/14743986780.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/97898378022.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tanivarave.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b726b848c389ba5d29bcf99ecbbb1377/fumakugefetuzu.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/12372155427.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/zudidenexogotejarakizago.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607677c482af2---70867067529.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/xixosadipipozelojoxebib.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ceecc78e2da3b64def29ba1c90807880/teviwitofopurod.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/larunaxolun.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/23123870772.pdfIn PDF document text
    • https://seikico.net/img-tym/files/nukekojegoma.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/melokakamajevozuvazabow.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/bojoseji.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a907dbcc1---7393478494.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094d84dd9b9c---38779778753.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///487347198.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/xirutufitelobanijivo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0444e2bed38b202adcb95ef06ca0e8c6/gepifosiviwamalaguteme.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/jakamujilofi.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/45542418781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+tower+of+nero+ebookPDF 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_off0001ad1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C534 10124 bytes
SHA-256: 395018e457ced04cfc2d12e7da99ee3212cc10ac6f31baf3de624e23f143e23e
font_02_sfnt_off0001dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBCD 22172 bytes
SHA-256: 1cd815bc36f972f68487e013e14403e205d9ba2d5e84b392950e207c6874db5d