Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1b71dc9af3af63…

MALICIOUS

PDF

88.2 KB Created: 2021-09-22 15:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8647fd1db9e2aa4c51f179b0d0268aed SHA-1: 55b3f30749056ccbf59a1a1d0e0332c380c3d284 SHA-256: 9f1b71dc9af3af63c85b08ef6cd70896c679c5e70e472db6afbdab3d036e1279
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. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's intended to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=neoragex+windows+7 PDF link annotation
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/be0300f665fa2cb6a0fb76cafdda7db0/visabiloragepeged.pdfIn PDF document text
    • http://cycling-software.com/files/file/43186601833.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/48754097925.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/33139899188.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bejopexut.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/saxafexuvov.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/torigunit.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/velavinudi.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/nufivonasarovatotapesare.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec4b252d7---25179410637.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/78229916090.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210913_1A044EF99547D9FC.pdfIn PDF document text
    • http://maksimetall.ru/files/xobugekejokotizaxoxubo.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/81014295051.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/99738225162.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/zadus.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/82384157386.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zamire.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/63019223471.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210905_AE42F44B866A9EF7.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/wafase.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/tadutaxujoxinitit.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1354f0be---jawubewevupunajulonav.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/5139643615.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_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 17128 bytes
SHA-256: b6ee9b31613261b1a6d7ebe21f595c83dec1de8e386434d7c14ba3ca13b34d67
font_01_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4A 10492 bytes
SHA-256: 7c9372bf8d7caea1a88b48868f371f60d29883d91ea596553f8ac73975c3552c