Malicious PDF — malware analysis report

Static analysis result for SHA-256 058e66f0225e5f84…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 10:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40ab1fc9889dfcf76069640e6c09880a SHA-1: a8113418e6e76a88f89726d43268f81ffa6fcfba SHA-256: 058e66f0225e5f847f3917a4ba648a03a78a6faf707651dea79e22f98c6fadfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs suggest an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://guclupin.com/calisma2/files/uploads/86711999251.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609874845442b---kusojoxolevewuvezamex.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/dasemolebajaxudotebavuwib.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16105ad3a347cb---ratuzozujivogipojitaxoref.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/73810293834.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/mesenus.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/33941309547.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/lezipuk.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f73728dad---pebekarenulunitakuxubeja.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/tajofok.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tunomaxod.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/35895303206.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160782973b9c7a---nizegiwadu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/toxadalinula.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1625400155.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/45860838058.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/zowedavi.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/71071958947.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/17033937144.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/73382710799.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/93532421754.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d6923b11---togowosafudarogemebanew.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b53795c84a8---lamaxevaxululo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/462b025f6e70522c4ea482e50ab4a882/fomiwezagam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nervio+hipogloso+pdfPDF 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_off0000cadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADD 18608 bytes
SHA-256: 66451de5c2e29b25a2dddd41067784d0b5e1e87f5eb4f5f40127efd8f5c41585
font_01_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 10456 bytes
SHA-256: 4b3776e5500873d3ee3304f7a376f1c12de3660919d16160677594bbc6db8738
font_02_sfnt_off0001133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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